Run crayons through a hot glue gun onto canvas.
Instead of hot glue sticks, put crayons in the hot glue gun and make stuff like this! (Under the painter's tape is a silhouette of two people under an umbrella. You can do a silhouette, too).
When I have time...
Hot Glue Gun Tips! How NOT to burn your fingers and lots more! #glue sewlicioushomedecor.com