Vaseline and caulk to make small molds. For reproducing small details, coat the original with Vaseline, then cover it with a thick layer of 100 percent silicone sealant. Let it cure, remove the mold, and fill with plaster of paris.
If you like gardening as much as I do, you may enjoy having some little concrete critters to add some extra interest. Perhaps some sweet little birds perched on a rock. ‘And they last winter and summe(How To Make Recipes Ideas)