choo choo crayons

I found a tutorial on http://homemadebyjill.blogspot.com/2010/10/diy-molded-crayons.html and was dying to make some of my own, and finally, yesterday, I did. I am doing a train theme for my sons birthday so I thought I would give it a try. I used an old soup can in a small pan of boiling water to melt the crayons. then poured them into the mold, and once they were set (about 5 minutes in the freezer) they were complete. Instead of scrubbing a pan from melted wax, I just threw the soup can I used in the trash, so nothing got ruined.