Owl bookmark, this would be cute in paper too or add elastic to the back so it fits all size books.
Hand Painted Stone Flowers / Set of 8 by ISassiDellAdriatico
Paint some pet rocks
Fruits and vegetables painted on stones
DREAM Painted BOHO FEATHER Beach Stone by PaintMyselfPretty
Handmade stone matryoshkas
Hand Painted Pebble Owl by ISassiDellAdriatico on Etsy
Owls - Painted rocks by Phyllis Plassmeyer