Here is a sun catcher heart I did with my kids. They sharpened crayons and we put the shavings between wax paper and hot ironed them until they melted. I then cut out the heart frames using my Cricut and we glued them to the paper and the kids cut out the hearts. We had the suction cup hangars from a different project.
My youngest loved this project and is already sharpening more crayons for the next time.