Plastiquem: PLOU I TOTS ANEM AMB PARAIGÜES. Crayon and watercolor umbrella drawings. Crayon resist with blue water correct over white crayon. Or cool colors over white crayon and make the umbrella warm colors only.
Paint on aluminum foil: add a small amount of dish washing liquid to your paint mix. Not only will that make cleaning up easier but it also helps the paint to stick to the foil better and not flake off when it dries. Art for kids.