i originally saw this project on pinterest and filed it away mentally for when we finally had a use for it. after cleaning out my craft space, i realized that we finally had enough broken crayons to give it a go. i found this cute little people silicone tray at hobby lobby and spent the afternoon peeling off crayon wrappers and breaking crayons into smaller pieces, while the bird colored along beside me. this was really easy and quick and we are planning on adding them to our "happy mail" packages going on this week. (more on our happy mail project later.)
there was a little trial and error. the first batch i made was from really old, big crayons. i had to turn the oven up higher to get them to melt. the second batch i made was from newer, skinny crayons and they melted much faster.
overall, i would saw that heating the over up to 300 degree and baking the crayons for about 20 minutes did the trick.