I'm working on making a dodgeball map for the fun server. I think it would be called tfdb_testfacility and it's basically a large warehouse with missiles lying around and such. Main point would be to make it pretty since our current dodgeball maps are a bit lacking. I'm thinking sort of like the central area of Turbine in a way.
Another idea could be a tron-dodgeball map. In fact, you can fiddle with the models to use anything for the rocket and it could be a lightcycle type thing perhaps. Another idea I suppose.