4 stones / rocks photoscanned with open source software (using openMVG and openMVS), they are based on own photos.
Warning: You need to use blender 2.78 or later, because it uses the new microdisplacement feature.
The meshes are cleaned, retopology is done, UV unwrapped and textures baked. Textures are packed in the blend-file, also included is a CC0 HDRI from blender cloud.
Very good rocks, thanks! You might want to use the principled shader so you get proper fresnel for free. I like how it looks with principled shader with roughness set at 0.9.
Nice work! Thank you for sharing! I'll credit you when I use it.
Nice