Our "arts" director sent us a video link that showed that you can use Crayola's new Dry Erase Crayons on aluminum foil. After doodling this flower on the foil...I starting thinking about the classroom application of such a project. I think creating a medieval unit....with a coat of arms as one of the lessons...would be a great use of the product. The major problem is that they are pricey. The ones I found were just under $4. Obtaining a class set would be a pricey venture. Maybe they price will come down?!