Did you know that you can make a skin with acrylic paint? You pour out a layer of liquid acrylic paint onto a non-stick surface and just let it dry. Once it has, you can peel it off, and then glue this ‘skin’ onto whatever artwork you wish.
I made a couple of molds using Amazing Mold Rubber–get the skinny,see the how-to, the AMAZING step-by-step at the Amazing Mold Putty blog!!