Hand painted pāhoehoe lava texture with emissive map.
Woods, Minkyung Yu on ArtStation at http://www.artstation.com/artwork/woods-a81ae423-46dc-402b-818b-4d9a3326ff47
Great Cloud Tutorial
Rocks Stuff by ShadowOfSunshine:
Some work I did as Lead Environment Artist on the ARPG Torchlight 2 at Runic Games.
Hand painted/sculpted texture - Polycount Forum