diff --git a/photobooth/defaults.cfg b/photobooth/defaults.cfg
index a733062..d581446 100644
--- a/photobooth/defaults.cfg
+++ b/photobooth/defaults.cfg
@@ -9,6 +9,8 @@ width = 1024
 height = 600
 # Hide cursor
 hide_cursor = False
+# Use specified style
+style = default
 
 [Camera]
 # Camera module to use (python-gphoto2, gphoto2-cffi, gphoto2-commandline, opencv)
diff --git a/photobooth/gui/Qt5Gui/Frames.py b/photobooth/gui/Qt5Gui/Frames.py
index cb1572f..bbfcd2a 100644
--- a/photobooth/gui/Qt5Gui/Frames.py
+++ b/photobooth/gui/Qt5Gui/Frames.py
@@ -31,6 +31,7 @@ from ... import camera
 from ... import printer
 
 from . import Widgets
+from . import styles
 
 
 class Start(QtWidgets.QFrame):
@@ -492,15 +493,24 @@ class Settings(QtWidgets.QFrame):
                                            self._cfg.get('Gui', 'module'))
         self.add('Gui', 'module', module)
 
-        width = QtWidgets.QLineEdit(self._cfg.get('Gui', 'width'))
-        height = QtWidgets.QLineEdit(self._cfg.get('Gui', 'height'))
+        width = QtWidgets.QSpinBox()
+        width.setRange(100, 999999)
+        width.setValue(self._cfg.getInt('Gui', 'width'))
         self.add('Gui', 'width', width)
+
+        height = QtWidgets.QSpinBox()
+        height.setRange(100, 999999)
+        height.setValue(self._cfg.getInt('Gui', 'height'))
         self.add('Gui', 'height', height)
 
         cursor = QtWidgets.QCheckBox()
         cursor.setChecked(self._cfg.getBool('Gui', 'hide_cursor'))
         self.add('Gui', 'hide_cursor', cursor)
 
+        style = self.createModuleComboBox(styles,
+                                          self._cfg.get('Gui', 'style'))
+        self.add('Gui', 'style', style)
+
         lay_size = QtWidgets.QHBoxLayout()
         lay_size.addWidget(width)
         lay_size.addWidget(QtWidgets.QLabel('x'))
@@ -511,6 +521,7 @@ class Settings(QtWidgets.QFrame):
         layout.addRow('Gui module:', module)
         layout.addRow('Window size [px]:', lay_size)
         layout.addRow('Hide cursor:', cursor)
+        layout.addRow('Appearance:', style)
 
         widget = QtWidgets.QWidget()
         widget.setLayout(layout)
@@ -524,14 +535,19 @@ class Settings(QtWidgets.QFrame):
         preview.setChecked(self._cfg.getBool('Photobooth', 'show_preview'))
         self.add('Photobooth', 'show_preview', preview)
 
-        greet_time = QtWidgets.QLineEdit(self._cfg.get('Photobooth',
-                                                       'greeter_time'))
-        count_time = QtWidgets.QLineEdit(self._cfg.get('Photobooth',
-                                                       'countdown_time'))
-        displ_time = QtWidgets.QLineEdit(self._cfg.get('Photobooth',
-                                                       'display_time'))
+        greet_time = QtWidgets.QSpinBox()
+        greet_time.setRange(0, 1000)
+        greet_time.setValue(self._cfg.getInt('Photobooth', 'greeter_time'))
         self.add('Photobooth', 'greeter_time', greet_time)
+
+        count_time = QtWidgets.QSpinBox()
+        count_time.setRange(0, 1000)
+        count_time.setValue(self._cfg.getInt('Photobooth', 'countdown_time'))
         self.add('Photobooth', 'countdown_time', count_time)
+
+        displ_time = QtWidgets.QSpinBox()
+        displ_time.setRange(0, 1000)
+        displ_time.setValue(self._cfg.getInt('Photobooth', 'display_time'))
         self.add('Photobooth', 'display_time', displ_time)
 
         layout = QtWidgets.QFormLayout()
@@ -563,21 +579,34 @@ class Settings(QtWidgets.QFrame):
 
         self.init('Picture')
 
-        num_x = QtWidgets.QLineEdit(self._cfg.get('Picture', 'num_x'))
-        num_y = QtWidgets.QLineEdit(self._cfg.get('Picture', 'num_y'))
+        num_x = QtWidgets.QSpinBox()
+        num_x.setRange(1, 99)
+        num_x.setValue(self._cfg.getInt('Picture', 'num_x'))
         self.add('Picture', 'num_x', num_x)
+        
+        num_y = QtWidgets.QSpinBox()
+        num_y.setRange(1, 99)
+        num_y.setValue(self._cfg.getInt('Picture', 'num_y'))
         self.add('Picture', 'num_y', num_y)
 
-        size_x = QtWidgets.QLineEdit(self._cfg.get('Picture', 'size_x'))
-        size_y = QtWidgets.QLineEdit(self._cfg.get('Picture', 'size_y'))
+        size_x = QtWidgets.QSpinBox()
+        size_x.setRange(1, 999999)
+        size_x.setValue(self._cfg.getInt('Picture', 'size_x'))
         self.add('Picture', 'size_x', size_x)
+        
+        size_y = QtWidgets.QSpinBox()
+        size_y.setRange(1, 999999)
+        size_y.setValue(self._cfg.getInt('Picture', 'size_y'))
         self.add('Picture', 'size_y', size_y)
 
-        min_dist_x = QtWidgets.QLineEdit(self._cfg.get('Picture',
-                                         'min_dist_x'))
-        min_dist_y = QtWidgets.QLineEdit(self._cfg.get('Picture',
-                                         'min_dist_y'))
+        min_dist_x = QtWidgets.QSpinBox()
+        min_dist_x.setRange(0, 999999)
+        min_dist_x.setValue(self._cfg.getInt('Picture', 'min_dist_x'))
         self.add('Picture', 'min_dist_x', min_dist_x)
+
+        min_dist_y = QtWidgets.QSpinBox()
+        min_dist_y.setRange(0, 999999)
+        min_dist_y.setValue(self._cfg.getInt('Picture', 'min_dist_y'))
         self.add('Picture', 'min_dist_y', min_dist_y)
 
         basedir = QtWidgets.QLineEdit(self._cfg.get('Picture', 'basedir'))
@@ -603,7 +632,7 @@ class Settings(QtWidgets.QFrame):
         def file_dialog():
             dialog = QtWidgets.QFileDialog.getExistingDirectory
             basedir.setText(dialog(self, 'Select directory',
-                                   os.expanduser('~'),
+                                   os.path.expanduser('~'),
                                    QtWidgets.QFileDialog.ShowDirsOnly))
 
         file_button = QtWidgets.QPushButton('Select directory')
@@ -635,11 +664,19 @@ class Settings(QtWidgets.QFrame):
         enable.setChecked(self._cfg.getBool('Gpio', 'enable'))
         self.add('Gpio', 'enable', enable)
 
-        exit_pin = QtWidgets.QLineEdit(self._cfg.get('Gpio', 'exit_pin'))
-        trig_pin = QtWidgets.QLineEdit(self._cfg.get('Gpio', 'trigger_pin'))
-        lamp_pin = QtWidgets.QLineEdit(self._cfg.get('Gpio', 'lamp_pin'))
+        exit_pin = QtWidgets.QSpinBox()
+        exit_pin.setRange(1, 40)
+        exit_pin.setValue(self._cfg.getInt('Gpio', 'exit_pin'))
         self.add('Gpio', 'exit_pin', exit_pin)
+
+        trig_pin = QtWidgets.QSpinBox()
+        trig_pin.setRange(1, 40)
+        trig_pin.setValue(self._cfg.getInt('Gpio', 'trigger_pin'))
         self.add('Gpio', 'trigger_pin', trig_pin)
+
+        lamp_pin = QtWidgets.QSpinBox()
+        lamp_pin.setRange(1, 40)
+        lamp_pin.setValue(self._cfg.getInt('Gpio', 'lamp_pin'))
         self.add('Gpio', 'lamp_pin', lamp_pin)
 
         layout = QtWidgets.QFormLayout()
@@ -664,8 +701,12 @@ class Settings(QtWidgets.QFrame):
                                            self._cfg.get('Printer', 'module'))
         self.add('Printer', 'module', module)
 
-        width = QtWidgets.QLineEdit(self._cfg.get('Printer', 'width'))
-        height = QtWidgets.QLineEdit(self._cfg.get('Printer', 'height'))
+        width = QtWidgets.QSpinBox()
+        width.setRange(0, 999999)
+        width.setValue(self._cfg.getInt('Printer', 'width'))
+        height = QtWidgets.QSpinBox()
+        height.setRange(0, 999999)
+        height.setValue(self._cfg.getInt('Printer', 'height'))
         self.add('Printer', 'width', width)
         self.add('Printer', 'height', height)
 
@@ -693,6 +734,8 @@ class Settings(QtWidgets.QFrame):
         self._cfg.set('Gui', 'height', self.get('Gui', 'height').text())
         self._cfg.set('Gui', 'hide_cursor',
                       str(self.get('Gui', 'hide_cursor').isChecked()))
+        self._cfg.set('Gui', 'style',
+                      styles[self.get('Gui', 'style').currentIndex()][0])
 
         self._cfg.set('Photobooth', 'show_preview',
                       str(self.get('Photobooth', 'show_preview').isChecked()))
diff --git a/photobooth/gui/Qt5Gui/PyQt5Gui.py b/photobooth/gui/Qt5Gui/PyQt5Gui.py
index f6f1c8e..3c513f4 100644
--- a/photobooth/gui/Qt5Gui/PyQt5Gui.py
+++ b/photobooth/gui/Qt5Gui/PyQt5Gui.py
@@ -18,6 +18,7 @@
 # along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 import logging
+import os
 
 from PyQt5 import QtCore
 from PyQt5 import QtWidgets
@@ -27,6 +28,7 @@ from PIL import ImageQt
 from .. import GuiState
 from ..GuiSkeleton import GuiSkeleton
 
+from . import styles
 from . import Frames
 from . import Postprocessor
 from . import Receiver
@@ -79,7 +81,14 @@ class PyQt5Gui(GuiSkeleton):
 
         self._disableTrigger()
 
+        style = self._cfg.get('Gui', 'style')
+        filename = next((file for name, file in styles if name == style))
+
+        with open(os.path.join(os.path.dirname(__file__), filename), 'r') as f:
+            stylesheet = f.read()
+
         self._app = QtWidgets.QApplication(argv)
+        self._app.setStyleSheet(stylesheet)
         self._gui = PyQt5MainWindow(self._cfg, self._handleKeypressEvent)
 
     def _initReceiver(self):
diff --git a/photobooth/gui/Qt5Gui/__init__.py b/photobooth/gui/Qt5Gui/__init__.py
index 4ff9c2e..8e97318 100644
--- a/photobooth/gui/Qt5Gui/__init__.py
+++ b/photobooth/gui/Qt5Gui/__init__.py
@@ -17,4 +17,8 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program. If not, see <http://www.gnu.org/licenses/>.
 
+# Available style sheets as tuples of (style name, style file)
+styles = (('default', 'stylesheets/default.qss'), 
+		  ('dark', 'stylesheets/dark.qss'))
+
 from .PyQt5Gui import PyQt5Gui  # noqa
diff --git a/photobooth/gui/Qt5Gui/stylesheets/dark.qss b/photobooth/gui/Qt5Gui/stylesheets/dark.qss
new file mode 100644
index 0000000..9e94741
--- /dev/null
+++ b/photobooth/gui/Qt5Gui/stylesheets/dark.qss
@@ -0,0 +1,87 @@
+QMainWindow, QWidget {
+    background-color: black;
+    color: #eeeeee;
+}
+
+/* Customizing settings */
+
+QTabWidget {
+    background-color: black;
+    color: #eeeeee;
+}
+
+QTabBar::tab {
+    background-color: #333333;
+    border-style: outset;
+    border-width: 2px;
+    border-top-left-radius: 15px;
+    border-top-right-radius: 15px;
+    border-color: #eeeeee;
+    padding: 8px;
+}
+
+QTabBar::tab:selected {
+    background-color: #666666;
+}
+
+QCheckBox::indicator {
+    width: 25px;
+    height: 25px;
+    background-color: #333333;
+    border-style: outset;
+    border-width: 2px;
+    border-radius: 5px;
+    border-color: #eeeeee;
+}
+
+QCheckBox::indicator::unchecked {
+    background: none;
+}
+
+QCheckBox::indicator::checked {
+    background-color: #eeeeee;
+}
+
+QComboBox, QDateEdit, QLineEdit, QSpinBox, QTimeEdit {
+    height: 25px;
+    background-color: #333333;
+    border-style: outset;
+    border-width: 2px;
+    border-radius: 5px;
+    border-color: #eeeeee;
+    padding: 8px;
+}
+
+QComboBox QAbstractItemView {
+    background-color: #333333;
+    selection-background-color: #666666;
+    border-style: outset;
+    border-width: 2px;
+    border-radius: 5px;
+    border-color: #eeeeee;
+    padding: 8px;
+}
+
+QComboBox::drop-down, QDateEdit::drop-down, QSpinBox::down-button, 
+QTimeEdit::down-button {
+    background: #666666;
+    color: #eeeeee;
+    border: none;
+    width: 20px;
+}
+
+QSpinBox::up-button, QTimeEdit::up-button {
+    background: #999999;
+    color: #eeeeee;
+    border: none;
+    width: 20px;
+}
+
+QPushButton {
+    background-color: #333333;
+    border-style: outset;
+    border-width: 2px;
+    border-radius: 15px;
+    border-color: #eeeeee;
+    padding: 8px;
+}
diff --git a/photobooth/gui/Qt5Gui/stylesheets/default.qss b/photobooth/gui/Qt5Gui/stylesheets/default.qss
new file mode 100644
index 0000000..70721cb
--- /dev/null
+++ b/photobooth/gui/Qt5Gui/stylesheets/default.qss
@@ -0,0 +1 @@
+/* empty stylesheet: use system colors */
\ No newline at end of file