It's pity but sometimes your ideas cannot be easily released because there are too few tilesets for the subject.
You are of course always welcome to add new ideas which fit into the world of AT.

Thanks to everyone who posted his ideas!

ae=already existing; ur= unreleased
Regions:
-canyon: ur (few tilesets, I would make a big black hole for this and a rope which leads down into a "cave").
-swamp: ur (great tiles for that)
-shortcut and long way: ur
-maze: ur (very easy to build and many varying creations possible).
-volcano: ur (there are some tiles for standing(←is that the right expression?) and streaming lava)
-desert: ur (you can also use the dirt tiles as sand tiles and there are also some cactuses).
-savanna: ur (a couple of tiles for dried ground and high/dried grass/ cracked ground and cracks itself)
-burned down region: ur (devastated ground can be found, but there are no smoky tree stumps for --that).
-island: ae (Either you use a bridge to get there or a ship

-Lava lake (ae)
-Lake ur
Buildings:
-dwarf settlement/mine: ur (easy to build; big selection of crystals and mining gear; even found 2 tiles for the dwarfs: a miner and an ordinary dwarf).

-mill: ur (Unfortunately, there aren't any tiles for this addition.

-rebellions camp: ur (should be hidden very good; you can be very creative).
-castle: ur (there are lots of walls and roofs... however towers are difficult to build because you can only see the front of it

-mage house: ur (region should be a bit crazy

-temple: ur (many kinds of columns)
-pyramid: ur (difficult, actually no tiles for inside and only a few for outside).
Traps:
-ambush: ur (If you go into a new map, you are quickly surrounded by enemys and you can't move anywhere).
-fire trap: ur (You fall into a pit and you get hurt by fire←that's difficult for coding though. After that, you remove the fire and can get out with a rope).
-monster trap: ur (You fall into a pit and monsters attack you).After that, you can get out with a rope).
-maze trap: ur (You fall into a pit and you have to make your way out of an underground maze).
Ideas for interactive tiles:
-collapsing tunnel ur
-landslide ur
-gate that opens ae (charwood)
Also see the the topics:
http://andorstrail.com/viewtopic.php?t=1701
http://andorstrail.com/viewtopic.php?f= ... t=terrains
I hope that this revision is helpful for everyone who wants to create maps.

I also use some of these ideas for Mt. Galmore which I create currently: swamp, castle and rebellions camp and if I have enough time the dwarf settlement.