I prefer to think of my saber as a mood saber.
Blue = Serious
Red= Feeling evil, but more in a Dr.Evil sort of way
Green= When I've chain smoked and feel a little woozy
Yellow= When I feel like naming my saber "The Banana from Hell"
Purple= When I'm feeling like a p!mp, never run with purple saber, I always "strut"
Orange= My usual color, it seems to bring me a lot of luck. Maybe it's a voodoo thing, but I don't practice voodoo, so that can't be it.