I recently got to paint some Salamander Scouts with a sort of cracked lava camouflage. I'm not sure that a camo pattern like this would work in a lava field (unless your cloak was emitting light- maybe camelioline does that?). But I was very pleased with the way it looks on the minis:
http://mediawonder.com/gallery/album...r-scouts-2.jpg
http://mediawonder.com/gallery/album...der-scouts.jpg