I don't live in an area that has rocks. Not rocks big enough to use like this. If I want I can turn them over and look at another face. I found a bag of rocks in my local Michael's. I gessoed them first. I think I should shellac them especially if I want to put them outside. Imagine them in your garden, little faces and eyes looking up at you. ☺ ☺ Paper weights? Hmm. I think I'll paint more. It was fun and I get to practice my faces.