I recently saw a Pinterest project involving crayons, a canvas, and a hair dryer; all items I happened to have in my own already! I immediately got to work creating my own. It's weird art, but I had a lot of fun making it.
My hands were a little messy after I finished with my "painting", and lots of splatters had overshot the plastic mat I'd set up, but they were so small they wiped right up off the hard floor without any problems. The crayons melted under the hair dryer in a surprisingly fast amount of time, and once you have the melted wax on your canvas, you can use the force of the air to move it around, blend it with nearby colors, make swirly effects, etc. I would do this again!