If you wanna manually change the cat paw's color, go here:
%appdata%\SampersonLabs\Programs\Desktop Cat Paw
the the color values are between 0 and 1, so a light grey would be 0.55, 0.55, 0.55, or a red would be 1.00, 0.00, 0.00. Try it out if you would like! (oh and yes, you can open a .funny file with notepad apparently.)