I think that we will have to cut down a tree with a herring...
you get terrain in a forest, and there are trees in forests. trees are generally cylindrical shaped.
there are streams and creeks that run through forests, streams and creeks have fish in them...and water, trees need water
so that means that we could have like 55gallon drums full of water stacked on top of each other in some sort of random order and the two alliances will have to separate them and stack them in the correct order, all while trying to keep from knocking them over on other robots and trying not to bust them as to spill water. then have to move the stacked barrels to certain locations on the playing field as marked by blue circles in the playing field carpet.
bonus points could then be awarded during the autonomous period for correctly moving to a stack of barrels with a certain shape on the bottom barrel such as a square, circle, or triangle...or a picture of a shrubbery
then again this could idea could be formulated from Monty Python and the Holy Grail and be completely wrong...but it's worth a shot
