All you need is a silicone mold
and Paperclay, which can be purchased at most craft stores, such as Michaels.
Pinch off a small section of Paperclay and press it into the silicone mold. Afterwards, scrape the Paperclay with a putty knife. Doing this step will give your elements a flat surface for gluing.
Now you need to wait. The Paperclay directions say it takes 1 to 3 days to dry (it took mine one day). You know your elements are ready when the sides of your elements pull away from the mold. If they don’t pop out easily, give them a little more time.
After the elements drop out of the mold, the backs will have a little bit of paper on the edges. You can easily remove this with your fingernail.
Now they’re ready to be painted.
I used Golden acrylic paints on mine.