Farm/field/rural
Dust Bowl (sandy, plain, minimal plant life)
Woods (not rainforest) a bit like Decidia, but perhaps more in conjunction with your swamp theme
Caves/Underground - I think Hipshot was working on something with a mine shaft at one point. A mine shaft would be interesting.
Mountains - Less like kineterra.
Post-apocalyptic wasteland - Ruination of what once was.
Docks
Dam
Hangar
Perhaps an island with volcanic activity - Would also be interesting to do an island at night; the variations of islands I have seen take place during the day.
Heaven and Hell
Abstract/Noumenal world - Lunaran was working on a map that was based upon abstraction
Lunaran wrote:fKd, those are some surprisingly metallic looking textures for an engine with no speculars. nice.
A little color makes a big difference:

oh yeah that's the map I'm making
viewtopic.php?f=10&t=51&st=0&sk=t&sd=a&start=5145
I'm sure if you explore your mind a bit you can think of something really outside of the box. Sorry for the lack of grammar above; I was just jotting down ideas.
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[url=http://teameventhorizon.com/]Team Event -O- Horizon[/url]
[url=http://mapping.maverickservers.com/]NoGhost Map Making Competition 2 (June 2010)[/url]