Your basic Trench CTF. But on a space map so there's zero gravity (or at least the illusion of zero gravity).
The map would be a large cube with an alcove on each of the 6 sides. 2 opposite from one another would be bases and the rest would be good staging areas. The walls would all be covered with 32 thick diggable bricks.
I thought this would be interesting as it would change how players act. Instead of making standard walls and towers (which are now useless) what would they make? It's like a terrarium! Change the conditions a bit and see how the ants react...
Anyways, thoughts? Good, bad? I'm considering hosting this as a server.