FF, Maya, Photoshop CS4, UDK
I used FF to generate normal, bump, diffuse and AO maps fro the walls. In Maya i used bump map fror displacement on a plane, i baked it to polys.. then i modeled the lowrez model from it.. so i got 512x512 displaced lowrez plane that i deformed, taking care that it was still tilable..
Ground plane is just terrain mapped with normal and diffue..