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According to this question we should start to discuss our future site logo as one of the top-7 items
What about morphing the circle of friends inside the orange dot into a question mark?
I'm no designer by any stretch of the imagination, but hopefully this will give you an idea what I'm thinking.
Maybe we can shoot the guys over at deviant art a shout. Maybe make a contest for Ubuntu site logo.
I know there a huge Ubuntu theme customizers group over there.