Compatible with Minefield 4.0b7pre (updated-see below), makes the Appbutton differently colored instead of the simple orange.
When hovered on, the Colors invert and text changes from black to white.
Corners are heavily rounded, the Appbutton is now in an oval shape.

Code is commented out, so you can easily change it, even set simple colors instead of the rainbow colorexplosion.

Updated, less rounded, and better placement due update (currently v12.0a1)