I just grabbed it from google images, but I would probably start plopping down dots in photoshop then using liquify to smear them and distort then. Then use the nvidia normal map tools to convert the height map to a normal map.
I just grabbed it from google images, but I would probably start plopping down dots in photoshop then using liquify to smear them and distort then. Then use the nvidia normal map tools to convert the height map to a normal map.