Green Mountains

Today I played around with Bryce terrains, This is what came out. Please download to view in full size!
I found a way to create forested mountains. It's a rather simple trick:
Create a high-res terrain with a rocky texture.
Save the Heightmap! Blend the Heightmap with a grainy material about 5-10 %.
I use an image editor; it should be also possible to do this in the Bryce terrain editor.
Duplicate the terrain (ctrl+d), delete the highmap and load the new hightmap.
Make a material: I use atmospheric clouds, make them green and scale down about 500% (bump 999%).
Rotate, scale and move the green terrain, only a tiny little bit! Should be very close to the rocky terrain but not completely cover the rocks.
The same way, you can create mossy rocks for example.