This, too, was to be a submission to a contest. It is a floating, team based Spleef Arena, where the goal is to push/punch the opponents off. It is possible to climb on top of some of the balloons, and there are some possibilities for sneaking up on your victim, so as to allow for some strategy.
BUT ITS NOT WITHOUT RISK! someone might be sneaking up on you from above, while you are about to surprise your own victim. it is Pushed Or Be Pushed for this map. I will put on the Download when I have finished the area below the arena, and the way on to it (probably using command blocks for teleport).

the pictures are outdated, I've added another main part at the Side-platform. the possibility to climb on balloons is not in these pictures, and that's why I haven't uploaded more. this is the project I'll probably finish first.