Mix and match 32 material instance which may be customized in four different color vectors. Also adjust how many pebble and rock details you want in the texture space itself with the mask intensity feature, leaving you with more variety when it comes to arranging the decals in your environments.

This is similar, with slight shader adjustments, to my Customizable Puddles and Customizable Grunge asset packs, and as with all of my asset packs, contains totally bespoke and custom content diligently made by myself for modularity and customization in mind.

And as usual, examples of their use in a scene can be found in the Overview map.