After collecting leaves, flowers, grass and twigs from the garden, we made balls from FIMO Soft polymer clay (easier on my hands, which weaken quickly) and flattened one side. Under the flat side, we placed a leaf or flower and pushed down with the palm of our hand. Another idea is to gently press grass or twigs into the flat side of the clay, as my older daughter did. Turning the clay over, we pulled off the leaf or flower - sometimes using the tip of a needle or knife to get the little bits out. You can leave some bits in and take them out after baking using water and a needle or your finger. Bake the fossil sculptures in the oven following the instructions on your clay package. Have you made faux fossils?