My favourite colour has almost always been some shade of red. Currently that shade is wine red (slightly purplish, dark red). It's difficult to find in clothes though, I've noticed. Seems to be rare. Although my swimshort are wine red! And I have a sweater in that colour too, but that's about it.
Then black and silver are all time favourites of mine. I'm generally drawn to cool shades and dark, rich colours.