Instead of coming up with potentially boring Arena ideas myself, I decided that the combatants should come up with arenas themselves. Just give me the general setting for an Arena then a few thing you would want to see or would find cool to add to said Arena.
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[b]THE SPHERE[/b] So, The Sphere is pretty big, about the size of a large house. The entire sphere is zero gravity, but the fighters have magnetic fittings on their feet, which allow them to stay on the ground and run up walls. There are multiple platforms suspended in the air. The bigger ones are stable and do not move, the medium sized ones spin, and the smaller ones can be pushed and manipulated. Also, there is a lazer that randomly fires from any surface of the sphere, except for platforms.