What if you are not happy with Kivy’s default blue theme? What if you want the accent colour to be red or green? Do you have to change the look of each control then? No, you don’t.
It turns out to be really easy, actually. Open your favourite imaging software (I use Paint.NET and Photoshop) and open <Kivy’s installation folder>/kivy/kivy/data/images/defaulttheme-0.png
This is the default look:
Just change the Hue of the image defaulttheme-0.png:
Save it and you have changed Kivy’s default look: