I'm not sure if you mean the bricks lining the wall or the actual stone, the first of which being an idea I had and put a ton of time into (Those round rooms? Yeah, those were made one brick at a time), but am kind of wishing I used a higher-res texture because they're too blurry for me. I'll try some sharpening filters and overlays to see if I can't salvage them, but I may just replace them altogether. The stone behind it, though, all placeholder. For me, though, the stone walls in dungeons is like, the very last thing I do. But walls are always a weak point of mine, I'm working on it.

The floor I used there is on CGtextures, I didn't do anything special to it other than some tuning to bring out details and get a color I wanted.
FloorsPortuguese0085