Often have community-created texture packs.
If you can tell me what you're using (e.g., Blender, 3ds Max, Unity) or what kind of stones (e.g., gravel, pebbles, castle walls) you need, I can find a similar, safe, and free alternative. Download File ABC Stone Set 37.rar
High-quality, scanned stone assets available via Epic Games. Often have community-created texture packs