I saw these moulds when Prima launched them and just had to have them cos I have been using icing moulds to make embellies for a while with smooth cast polyurethane.
Here is my little decoupage blank that I made over using the moulded items from both my icing moulds as well as the IOD moulds and Finn's rust paste set.
They start off white and you can make them any colour you like. The Prima moulds by Iron Orchid Designs have a wonderful finnish to them and paint adheres so beautifully.
After I painted everything black, I then added the metallic paints, but that was not enough for me, so I rusted parts of it...
This link is a video of how I pour my moulds.