Use duct tape for words. Place crayons on top. Blow dry on high heat till crayons melt. Blow dry side to side to blend colors. Slowly remove duct tape to reveal words. I've seen the crayon thing before, but love the duct tape idea!
This crayon art is beautiful! "Heat crayons up with a blow dryer and draw on canvas or other porous surfaces. Layer different shades of the same color for the best effect."- could be cool to make hair using melted crayons
Glue crayons to a piece of cardboard or to the a canvas. Then get a blow dryer, turn it on, and hold at an angle. The crayon will start to melt and drip in the direction of the hot air. Put cardboard behind the art piece, the crayon will splatter.