colored pencil on rocks! (looks like dichroic glass!) SBG thinks you can spray on waterproof sealer and spot them into strategic places in the garden or among potted succulents. Thomas since you love you some colored pencil. and garden.
Use rolling pin to make an imprint on clay. Pick a flower or plant and lay on top of a small piece of clay and use a rolling pin to make an imprint in the clay. let it harden. -These would make pretty magnets.