Melted crayon hearts: A boy in my class a couple years ago gave these as little Valentines made out of melted crayons. He said, "For Crayon Out Loud, Happy Valentine's Day". could also say, "You COLOR my world!" Use silicone cups to melt them in.
Run crayons through a hot glue gun onto canvas. A design or letter would be cool too. (**Do NOT do this try the other glue gun crayon projects don't put the crayons in your gluegun! use the dryer with them glued to canvas)