i was designing a new icon at some point awhile back and found this ridiculous hippo face so i started with that.  Then i thought, "What kind of background does this goofy bastard need?" and a rainbow came to mind.  I'm straight, not gay, but I figured the rainbow would look funny and then i could be "RainbowPotamus" which to me sounded kinda funny and idiotic.  I think it sticks out and people remember it so I guess that was my hope.