I wanted to do something I see done pretty regularly on sites like polycount. When you need to achieve a certain look and effect in your scene, sometimes the best thing to do is just sculpt it out so you can accurately achieve what you want. The nice thing about sculpting is that you can move around geometry and having that tangible object allows you to create something unique.
I decided that I would work on something simple like a rock wall. I guess this could also work for a rock floor if the depth was evened out a bit.