Always really liked those darkish blues, but I'd have to say my favourite colour has always been purple. I guess it's because I used to be really fond of this song that went along the lines of
"One eye, one horn,
Purple people eater!"
(some more words go here)
Kind of weird now I think about it, but I really liked purple back then. It's also a relaxing colour and instantly makes me feel better. I also like yellow quite a bit, it's the symbol of happiness and gets me in a cheery mood, it brings life and colour into something dull and is generally a very positive colour.