A stone wall PBR texture I created for a medieval castle:
https://www.artstation.com/artwork/EVYYG0
I needed a texture that would work well for large surfaces. I created 3 variations of the basecolor map with slightly different distributions of stone colors to further mix it up (not shown here).
100 % Substance Designer. Rendered with V-Ray.
You can get it on ArtStation marketplace:
https://www.artstation.com/archaeotect/store/GbVM/dark-stone-wall-pbr-texture