My great-grandsons are leaving their marks... on each other and PawPaw's shed.
Liam (almost 7) sneaked up on two-year-old Charlie and left his handprint in shaving cream. Charlie freaked out after I showed him the photo on my cell phone. He tried to douse his back with water, but soon forgot about it when I brought out the paints. Three-year-old Alex loves painting outdoors.