koth_berlinwall
koth_vegas
koth_venice
koth_australia
koth_cowboy
koth_area51
koth_spacerace
koth_paris
koth_picket [set in an idyllic 60s suburb!]
Hope I was of assistance!
Oh, and if it's layout you mean, then do something cool like a room within a room, or some interesting variation on a multi-storey map