I will write up a quick tutorial on the heightmap method tonight when I am at home again.

I kept the details on the ocean floors simply because in a world where water breathing spells are easy enough to procure, and elves live in submerged cities, it might be handy to have that information.

Also, the made the heightmap an overlay layer above the flatly painted land and water layers, so I'll have to mask it off to hide it.