A visual breakdown image of how I went about creating this Cobblestone Substance. It contains notes as well to try and best explain what I was thinking or why I did something.
A Custom node im using is the Randomize Mask node. Credit goes to Sergey Danchenko. You can find it here.
https://www.artstation.com/artwork/1alxX
Hope it's useful in some way! Thank you for any money you feel this may be worth. Any support is much appreciated. <3