Take crayon gratings (cheese grater!) and melt them between waxed paper. I've seen place mats made this way (bind the edges somehow - sew, glue on paper edging, whatever), and I've also seen little shapes (like hearts) cut out of the waxed paper and used for various purposes (like gift toppers). Here's some cute ideas:
http://www.marthastewart.com/article/crayon-stained-glass-heart-cards-with-blaney-and-meghan?autonomy_kw=crayon
http://www.marthastewart.com/good-things/crayon-hearts?autonomy_kw=crayon
http://www.cutoutandkeep.net/projects/crayon_wax_spatter_painting_2

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