Rock Painting Whether you use them as doorstops, paperweights, bookends or to decorate your home or garden, painting rocks can be a fun project that everyone in the family can get involved with. Rocks are a great natural art material. They come in all shapes and sizes and your imagination is the only limit. It’s easiest to use smooth, flat rocks and oil colours and sharpies for the best result. Please send us pictures of your finished projects and your kids having fun making them!