In the game, the worlds are only descriped as being "beyond the paintings." Where do you guys think they are? Alternate universes? Luigi's Mansion-style painting worlds? (see the final boss battle) Actual locations in the Mushroom World?
There sure are a lot of deserts in the Marioverse, heh, maybe we could make a "Category: Deserts", could have Angry Aztec, Wild West, Gusty Gulch, Shifting Sand Land, Shiver Snowfield (its basicly a tundra, there counted as deserts)... could work.