Decorate stationery, postcards, or a travel journal using tokens collected on a recent trip. Lay shells or stones on thick paper, and spray the area with watered-down paint. Abstract patterns emerge on the paper underneath, recalling a dappled sky.
This is a great idea for stamping and color mixing for younger kids still working on their fine motor skills (as long as there's close supervision with those balloons, of course!) Painting with balloons