I had totally discounted the idea of water and robotics - up until now!
If anyone wants to check out a highly interesting application of the Basic Stamp to a water/robotics theme, give this one a try:
http://www.remo.net/spiders/
Now, if that isn't a great idea, I don't know what is. I still don't see how it could be worked into the FIRST competitions, but it sure would put an interesting twist on things now, wouldn't it?