from kivy.app import App

    class ColorPickerApp(App):
        def build(self):
            cp = ColorPicker(pos_hint={'center_x':.5, 'center_y':.5},
                             size_hint=(.5, .5))
            return cp
    ColorPickerApp().run()

http://wstaw.org/m/2013/04/17/plasma-desktopq13654.png