Time for another kids' craft using one of my favorite craft room staples, the warming tray!
If you don't have a warming tray yet, you can use any electric griddle. I recommend getting one at a garage sale or thrift store that you can dedicate to crafts though. Don't use the same one you use for pancakes, unless you have a fondness for eating wax (no judgment here).
You'll also need cardstock, a paper scrap cut into a heart, some unwrapped crayons, and a mini grater (again, dedicated to crafts). If you don't have a mini grater, a plastic knife works too.
Turn on the warming tray. Place the cardstock on it, then put the heart in the center. Use the grater or the knife to grate/shave crayon bits over the paper. Put the heaviest amount of shavings near the edges of the heart, decreasing as you move away from it.
The wax will melt within a few seconds. When you're happy with the amount of color, unplug the warming tray. Remove the cardstock, then carefully lift the heart up and discard it. You can add a message inside the heart or leave it plain.
This craft works just as well with any shape in the center. Try it with a monogram, a star, a lucky clover, or anything else you can dream up!