I recently saw Grant Thompson aka The King of Random's mini-metal foundry. The project was to cool to pass up on. So, I made one and was pretty pleased with the results. Following is documentation I did in the form of pictures and a video.
Actually, the green foam didnt work but the picture
was a good way to explain the parts of a casting model.
The final product, a necklace made completely out of soda cans includig the soda can tabs
(Also from Grant). Learn more at: http://thekingofrandom.com
I made this while in American Samoa. American Samoa is kind of by Hawaii, and is very rural. Because it was so rural, it was very hard for me to find the supplies I needed to make the foundry.