We have one of these and someone put a piece of a popsicle stick and wrote "Rock Concert" - Love Rock Art.Garden Trinkets - Awesome Ideas, Projects and Tutorials! Including, from 'instructables', this creative 'garden thing' project with rocks.
29 Of The BEST Crafts & Activities For Kids (Parents love these, too!) Painted Rocks -- 29 creative crafts for kids that adults will actually enjoy doing, too! Need fantastic tips and hints regarding arts and crafts?