realistic canyon walls????

[Wanderer]

I haven't seen it yet, but I'm pretty sure he either used the FloorLofter or imported a brush from another program.

[Stryker]

I still cant seem to get a "canyon" to look right in Ued. I would like to do something like what -=¤willhaven¤=- did in CTF-Stronghold with the canyon walls. I cant figure out how he made the brushes to make the walls though. Any help?