Try a gyro for wheelies? Kinda doubt it would work, but it would be col to try.

With a 3rd channel (which I have and might try), put a camera on it. Not sure what good it would do to take stills, but it would still be cool!

Other ideas... Spray can for making lines/graffiti. Wait, who said graffiti? Wasn't me or any kind of shooting mechanism (airsoft, paintball, BB's, water gun (not the best idea in electrics..).