Help with making a terrain filled with snow mountains

Hey there… i am completely new to World Terrain. This is an awesome software and i am overwhelmed by its output. I am stuck at making rock textures for my snow range. Please help… I am attaching my .tmd and the input file…tht was sculpted in Mudbox. I will put in a drop box link for my heightmap that was exported from mudbox.

https://dl.dropbox.com/u/67865856/Default%20Material_terrain_practice1_heightmap_g800.tif (map)
https://dl.dropbox.com/u/67865856/terrain2.tmd (.tmd)

also here’s a height map of the terrain. i dont knw if this would help. this was derived from

i am trying to make my terrain look something like this
http://world-machine.com/gallery/index.php?page=0&sort=recent&entry=67