Most people choose green - I veer towards purple then wonder if I really DO want to read people's minds. It would make for bitter reading, I am sure. Yellow really appeals, but recently I have been having horrible dreams about dead cats, owls and crows - so maybe not. Grey for invisibility seems really cool - I could jet around the world and take photos, if indeed they would come out. if not, it would be a pretty pointless superpower. Not overly bothered with red or blue; orange is interesting.
What would be yours? Comments below, please.