Some Ideas:
Portion of European styled city (narrow roads and buildings with lots of alleys, overhangs, and all at schewed angles
Construction site, Im thinking a large frame with some cranes at the top that hold various capture points and objectives suspended in the air.
Cbrown towns. Ever played Half Life 2? sorta like a section of those cbrown towns, mainly the ones twards the begining with lots of buildings on the edges.
Mile High Club. place towers of bricks that look like iron beams really tall. so tall that from the top they fade into fog, at the top can be a variety of hovering construction equipment, maby some modular looking buildings that look like they could be slotted into the beams (think jetsons, but with many pillars for one building.
Atoll. Ever watched the movie Waterworld? its basicly a small junkey floating island/village.
Oil Tanker. Simple, defenders defend the tanker, pirates board from a small boat on the side
Rainforest canopy. like mile high club, but with multiple tree trunks and alot of branches, maby small tribal vilageor somthing
Cube: lots of medium sized identical rooms, 4 doors one each side and ones in ceiling/floor, have lots of createve deadly looking things, maby add a cereal number to each room. and add teleporting to ones closer to the center if you travel too far.
City of Ember. based on the book, large underground city lit by failing electrical generator and surrounded by deep death ditch.
Highway robbery. lots of vehicles on a large 8 lane each way highway, touching ground kills.
Sacrafice to the boom god. set inside a volcano, get some tunnels, paths across big lava, some tribal totems. if someone dies and falls into lava then the lava rises or something deadly to everyone
Well its 2 am and I am out of ideas
