You can decorate them and paint them and then you can have a rock family. You can aslo put rock or gravel on roads. You can also use them to fill holes in your drive way. When you are gardening, you can put rocks in your flower bed for decoration. Your dogs can digest the rocks and they go through the dogs body and come out the other end. Then you have to pick rocks up out of your yard. You can also collect them and start your own rock collection. Then you can get rich and show them at a rock museum. You can also throw them at people when they are bullying you and trying to attack you or something.