I've read about these in magazines before and always wanted to make them. We got a cheap silicon pan at IKEA and have oodles of broken old crayons that were waiting to be revived. Warning: if you use a silicon pan, it gets floppy when you take it out of the oven and liquid crayon all over the bottom of an oven can't be pleasant to clean up, if you do this, put a pizza stone under the pan before putting it in the oven. It took some crafty maneuvering on my part to get this out of the oven onto the pan with no spills. We put them in a preheated 275' oven for 10 minutes, then put them outside to cool, they popped right out of the pan, no greasing was necessary (at least with the silicon pan).
Getting ready to go in the oven:
Coming out of the oven:
Using the new crayons:
Beware, my husband thought they were candy and he almost ate one for dessert, they look delicious!