I'm not a map designer, nor do I have the desire to learn right now, but I'll give suggestions. Feel free to use them or completely ignore them.
How about a hallway where the floor, walls, and ceiling are nothing but jump pads (if possible, with various angles). That way you're bouncing around while trying to traverse the hallway. Maybe put a pickup at the end of the hall to entice people to enter.
An alternative idea would be to have a hole to drop down into, kind of like the entrance above the flag stand in Citadel. However, the walls of this hole are all jump pads as described above. Jump perfectly into the hole and you move through with no problems. Touch a wall, though, and you're in for a ride.
Sorry if someone has already done this.