Last year we (like many teams) used a cut down 5 gallon bucket for our Frisbee hopper. I was thinking it would be fun to stack buckets in a pyramid. Points awarded for # of buckets stacked and overall height.
Of course your alliance would also try to knock down the opponent's stack. If that's too easy, maybe restrict robots from crossing into the "Pyramid Safe Zone". They'd have to knock the stack down with a long arm, or perhaps roll a game element into the stack?
Here is an interesting video of the First Presbyterian Youth Ministry (Oostburg, Wisconsin) setting a bucket stacking record.
