These are three high-poly rock models that you can use in various ways. For reference, you can see a ZBrush render that I’ve uploaded. The models are available in ZTL, FBX, and OBJ formats. Please let me know if you have any questions.
OBJ (OBJ, filesize: 183 MB), FBX (Autodesk FBX, filesize: 287 MB), ZTL (Zbrush, filesize: 380 MB)