During the last few weeks I was working on the terrain for my game. All scenes in the game are generated randomly, so the ground texture needs to be randomly generated as well.
I do this by building up several layers. First, an opaque tilable texture is repeated to establish the base. Then on top of that transparent decals are laid down with random location, rotation, scale etc. Then, track marks, road tiles, pavement / cobblestone and grass decals. Below you can see the results.

I think it turned out pretty well.
Unfortunately, the scene generator needs more work - some objects are placed a bit oddly.