1. Experiment with different combinations to come up with animal shapes before gluing everything into place. We chose small scallop and clam shells for the koalas, and long razor clams decorated with ring-top cowries for the tree. 2. Use small cushions of polymer clay, which is pliable and slightly sticky, to test out various arrangements. For assembly, a tacky, quick-drying glue works best. Build heads and bodies separately. clay to support creatures while glue dries.