The models and Base textures for this set are free. You can find them here Short Flat Rocks - Base

A set of 6 short, flat rocks, all sharing the same 2K texture in .png format. Textures have Diffuse, Specular, Height, and Normal maps. Some color options also have Emission maps. The models are low-poly, game-ready, watertight, and can be subdivided. Available formats are 3ds .obj .fbx .blend, and .dae. Previews were rendered in Anim8or. Blender was used for file conversion.

If you find this useful, look at my other models. There are free samples for most of my sets.