how to get terrain texture/material from other maps

Hey, I would like to make a snowmap but there is only one ugly snowcolor(snow-rock or something) in my editor... Is it possible to get the snow textures/color and materials from map like arctic lion or dovre winter, and shouldn't those files already be in the mods/pr/common_client.zip?
Also how do I get new materials into my pr_edit version? I can't find materials anywhere:/

Edit: Seemed to work fairly well with white sand texture. Still not sure about the material though.