Even if not your room, where you spend most of your time? I have heard that the color of your room (or where you spend most of your time) affects your mood. There are certain members that I imagine sitting in certain colored rooms just for that fact, heh.
My room *was* hot pink and lime green... But I recently moved and now it's a boring beige and white. I still haven't decided on what color I'm going to paint it, just because I want something more mellow and less dramatic than the hot pink and lime green from before.