TG bLock. Well, perhaps the inside of a big live volcano, with erosion, and some glow and magma at the bottom seems like a nice challenge. I saw this in a docu the other day and it really impressed me. Debris, some plants clinging to secluded crevices, smoke here and there, hard ridge, and the voronoi shapes of glow deep down. Typically something that can be done in TG.