The Basic Suite:
Oh yes, and the underground levels can only look like this (on a regular basis ;-) )
Other self made blends:
Although the editor only comes with five basic terrain types for the top level, the different tiles may be mixed to create other kinds of terrains. Many map makers have done this to a great effect. Try mixing them up and see what you can get.
(Look it's the Amitiville Horror House!) Put a few fires and you'll have a volcano that looks ready to roll. Mixing wasteland trees and grassland trees makes the forest look darker.
Guess what? These are just some examples of what you can make with the editor. Mix and match - make a new terrain today!