Rock Terrain Sculpting Tutorial Renders!, Tyler Smith : Check the tutorial on how I made it in my store 
https://www.artstation.com/tsmith3d/store

Stoned, Aron Kamolz : Some rock works/training in Vue 2015. Big rock structures are procedural functions. Small rocks are eco system distribution. 
Thanks for taking a look

vojtech-lacina-turntable016.jpg (1920×1080)

Stone, Vojtěch Lacina : Sculpted in  Zbrush, textured in Quixel. Lowpoly 20k, textures 4096x4096

Dungeon Stone Floor - Substance, Matthias Schmidt : Another Substance that came as a result of me fiddling with my new edge wear node. My original plan was to try and make a stylized floor that looks zbrushed similar to the work of Michael Vicente. I stru

Procedural Cliff Pieces - Houdini, Tom Carter : Completely procedural cliff pieces created in Houdini, all images are variations from the same graph - an on going bit of learning

Desert Ground Rocks, Enrico Tammekänd : Followed Daniel Thigers tutorial here: https://www.allegorithmic.com/blog/substance-designer-making-incredible-materials-daniel-thiger-aka-dete and ended up with something similar to what he did for his Signature Se

Blue Crystal, Aaron Fowler : Inspired by the lava crystal by Lukas Köhne. Breakdown by Lukas Köhne: http://polycount.com/discussion/comment/2386386/#Comment_2386386

Textured in Substance Painter 2. Rendered in Marmoset Toolbag 2.

Mossy Rock, Ben Wilson : I got the chance to work with Jonas Ronnegard on his first Substance Masters Pack! I built a mossy rock material for the tutorial pack, with graph commenting, recordings of the development process and even some marmoset files for 

tangi-bodio-ctrnf-art-dingocanyon-02.jpg (3840×2160)