I sculpted these guys with a Euroshop polymer clay, and cast them in plaster using a silicone caulking mold. The will be used on my gothic Cathedral build (see the comments) :
Amazon.com: Human Cake Decoration Moulds, People Shaped Doll Molds Fondant Molds for Cake Decorating Face Molds for Polymer Clay Baking Decorating Tools
Sculpey Tools Silicone Bakeable Mold – Pet and Baby
How to Create Polymer Clay Figures for Stop-Motion Animation - HubPages