I'm restarting my terrain collection, and am going for an urban environment. If you want, you can look up the terrain I'm going to be using at: www.bplaser.com. I'm going to be using their 28mm Sci-Fi Buildings; particularly buildings 01, 02, 03, 04, 05, and 06.
I want to say that I could spray the exterior with an adhesive and coat the surface with quikrete, or something like it. I'm going for a concrete look, but I'm not totally sure how to execute that.
Does anyone know a better way to get the look and texture of concrete? Any suggestions would be awesome.