In TFC, there are twenty one rock types, and they all have had the same vanilla cobble pattern. Actual rocks of each type break very differently from one another, with various patterns textures and details.
These are my renditions of the 21 rock types of cobble for TFC.
There are a good number of rocks in the rock garden that match these types, and so I can detail them rather precisely, considering a 16x grid.
There is more to come, I have also designed brick patterns for a few of them, however the cobble designs fit with TFC more closely.
I'm getting the details a lot closer to how each IRL rock type looks, while keeping the general colors approximate to TFC. The cobble patterns also determine the patterns on the cobble walls.