Knead-a-Mold, from Townsend Atelier for DIY silicone rubber molds that set in less than 10 minutes. The final mold can be used in the oven (for polymer clay) and is food safe as well! Use to make soap?
Make your own Silicone Molds with silicone caulk and flour/baby powder/ corn starch. (She used the hot glue as the modelling medium, instead of using poly clay)