Tile derpings

[Chris2Balls [:B]]

These work pretty well, actually! I think the patterns for the darker stone tiles could have a better transition between the shades of grey. Making the palette warmer (more red) could make the stone blend better with the earth, and seem more like it's affected by the ambient light of the earth, too. The stone tiles on the right on the ceiling are regular: I'd suggest you follow what you did with the other stones and break the regularity. That or make everything very regular, which could go with the blockiness your tiles currently have.
Something else to consider is whether you want to keep the blocky shape of the tiles, or if you're going to make it more organic.

I'm looking forward to more!