Played around with an old hand-painted rock texture that I made ages ago (pre-Zynga times). Used Crazy Bump for some quick normal and displacement map generation, then built the scene inside of Blender using some box modeling and a ton of modifiers. Fortunately, all of this detail can be crunched down to run-time graphics with minimal quality loss (and minimal work thanks to Blender's decimation modifier).
To do: add some more stones to the ground to
Blender Viewport with some Photoshop colour correction.