Ok, I started the project yesterday, but rather than doing a full skull I decided to use one of the bones from my Bag of Bones in case I messed anything up. I have a couple pics, but the whole bone hasn't yet been covered by silicone. I came up with another idea using the Wal-Mart silicone. Instead of covering one side of the bone with silicone, waiting for it to cure, then doing the rest...you could take a piece of cardboard (or wood would be better) and make a box that is barely bigger than the bone. This would serve 2 purposes: to hold the bone while it cures and to serve as the mother mold. I'm not sure if that made much sense lol, so I will do it today (hopefully) and take some pics and write up a tutorial. The tut should be ready in a couple days