Desert Rocks pack with 33 rock models, nice terrain with 4 different desert materials.
Each model has 4 LOD stages.
In example video, with baked light maps, FPS is very high, over 400FPS.
Small rocks have only 2 textures, which ensure you fast rendering with very few draw calls!
Few poly-count examples:
Rest of rocks are usually 3K triangles with 4 LODS inside!