Karsch materials - As seen in pl_fractal and other maps Custom black rock wall and gravel-snow blend recolours of standin materials, as seen in pl_fractal/pl_dipole/etc. Screenshots:
I like the last screenshot. It shows just how much light this rock will swallow up Very neat though, I imagine you could make some really cool things with this. Having pitch-black, spytech interior rock walls comes immediately to mind.