I first encountered painted rocks, when a high school friend in Florida started painting them an placing / hiding them. I think placing is a better term, you want them to be seen. If you start looking around, you will see them, from time to time. John over at Going Gently showed them recently, as did the Mistress . They are not hard to do, rocks, a little paint, a simple message, tiny works of art. A few have started appearing on the top of the hill.