5 Ideas for a pvp map:

1. A space one. A map that basically takes place in space. Perhaps on a certain planet like Mars or Venus

2. A train. I feel like a train would make for a good CTF map. *Note that you can go below the train to go on the tracks and above the train. However, the flags are in the train on opposite sides.

3. A boat. I feel like there is one already made, but just in case there isn't, a boat.

4. This is gonna sound boring and stupid, but naturally spawned-minecraft terrain. Sometimes it's nice to duke it out in normal minecraft land.

5. A sky one that involves cloud jumping and stuff. Clouds can be shaped like anything so you could make it however you want.