BLACK - LOL - probably the one color I *haven't* worn!
I love nearly every color, but I have to be mindful of looking professional too. I'll do metallic charcoal, purple-black, deep deep red, dark brown, copper, red, orange, pink, even occasionally metallic teal - but not black or blue - they are too hard to pull off and still expect people to take me seriously enough to pay my fees, LOL.
Same here, no black nail polish. I love pink-ish purples for spring and summer,and I like darker hues such as burgundies for fall and winter.