Today I created a white rock mountain.
Base shape was made with World Creator PRO standalone, it was then further altered with erosion in Gaea, from where I also exported data maps that then been used in World Creator to texture the terrain.
What I did in final project was I exported the heightmap from World Creator base shape and exported heightmap from Gaea based on the World Creator base shape and mixed it together. The World Creator map was the base where the Gaea heightmap was applied in Max mode where I could preserve the nice rock shapes and details while i was able to get those nice sediment layers from Gaea.
Textures are from Game Textures.
In Unity i used Enviro and Microsplat.