There isn't much to this one, but it looks sort of cool, what with the transparent tree overlay and all. The indoor areas would be the hut tileset like islands/the original matango interiors.
These aren't the prettiest maps, and they were pretty annoying to navigate in the original (mostly due to characters getting stuck), but they could make for an interesting maze or something.
Witch's ForestDefinitely one of the better looking tilesets in the game. Shouldn't be too much effort to generate - everything is on layer 1 since layer 2 is full of clouds.
Upper LandThe SoM Editor doesn't really view these correctly for some reason. Might be annoying to generate with the large trees and making them flow smoothly together.
Sunken ContinentThe gray hallways and stuff from under the purple continent. I guess that "subway" map could be the interiors with the NPCs.
CliffsThe area around Shade's palace with the slow-scrolling layer 2 background. Looks pretty neat I think.
DesertSeems like something that should exist just based on it being a notable place with a lot of unique enemies, but I think I'd have to do a lot of tileset fuckery to make this work with the way I currently generate maps. The desert itself and Kakkara are separate tilesets, and without the little Kakkara houses I have no idea how I'd make actually "indoor" areas work.
Ice PalaceI like the exterior of this place a lot, but the interior is really just my ruins interior with a blue palette. There might be a way to make it unique enough from the Ruins stuff to use. I would really like an excuse to use its song.
Ice CountryIt's a nice looking tileset with the rainbow trees and all, but there aren't really any interior structures available on the tileset except caves. There might be a way I could combine the Santa's Workshop/Toto houses into it and have that work somehow.
Desert Ship ThingyI sort of like this as an indoor/outdoor maze of sorts like the Ruins are now.
TownThis could maybe be made to work, with a mazelike structure to the exterior.
Mana PalaceThis one is sort of a staple of SoM. Would probably be nice to see it worked in somehow.
Witch's CastleNot sure exactly how I'd make this one work, but I do like how it looks.
PurelandsLike Upperland, this would probably be kind of a dick to generate procedurally and still have everything fit together and look good.
Manafort ExteriorThere isn't really much to this, but it could probably be made to work somehow.
Undersea ThingyThe first part of the sunken continent that looks like it's supposed to be under the sea or something. Pretty nice looking tileset.
Luna PalaceAnd then I guess there's this.