As the title says. More rock surfaces for cliffs and mountains or hills (these are the hardest to get) , more grass variety more dirt variety, dirt roads, forest grounds etc etc ? Both real and stylized.

I wont hide that i sub mostly for the substances You offer in the substance source library and b2m, since i am not an artist at all :). I mostly do a programming so all textures i use depend on what You and the other sources like gametextures offer in their store :).

I really notice a real lack of terrain surface materials (for landscapes in UE4 or Unity etc.) in all stores that offer materials. I mostly see fabrics, woods, metal etc. It would be nice to get more stuff for terrain and level creation :)