As a male RBKA, I can't imagine doing anything to make the prosthetic look nicer. I wear jeans all the time save for playing tennis. I know people put designs on their prosthetic. Function is what matters to me. Of course being female is a whole other story!! Looks nice.
I'm a male LBKA, and I like to wear prosthetic covers with a colored socket. I think it goes with my general style. I wouldn't paint the nails, but I think the potential to make it look cool is a nice opportunity