[Donut]

Two ideas for unusual game pieces: plastic easter eggs or the low friction tire from the small vex wheels (just the tire though).

And if you're ever looking for something really challenging, you can always develop a wall robots would have to climb.

Other than that our team didn't compete in Vex and I didn't get to see more than one or two matches of this year's competition. If they'll be a competition out in Arizona next year, we'll be happy to give you feedback on the game though!