We've got the crystals so they can be jutting out from any of the 6 faces. I might also add 2 mutation bits for 4 rotations on each face.
Crystals
I've added one version of crystals. There's still some texturing stuff I want to figure out but they actually don't look half bad they way they are.
Wrong Texture on Crystal OBJ Model
I'm in the process of adding crystal formations to the caves and I accidentally applied the wrong texture to model. Looks kinda cool.