It's just the diffuse. I sculpted the rocks in zbrush, baked the AO, then did some poly painting(that turned out crap)fixed it, did some additional painting and made it tile in PS.
i'd say that looks like a very nice. the color overlay is a bit too much and might look better if it was restricted only to some stones to get more variation from further away. paint in some darker or lighter values on some stones too so they don't look like they all line up perfectly. the moss could need some highlights…