Set up a space for your child with a canvas panel, tissue paper, and a glue stick.

Have them spread a layer of glue over the canvas

Place the tissue paper over the canvas as they wish. Once they have their masterpieces in place, lightly spray with water over the entire canvas. If there is bleeding awesome, if not, no problem.

Once it's dried, an optional step is to spray your art with spray glue, clear spray, or run over the top with mod podge/glue. This will assure their art is in place, but not necessary.