Concrete Garden Art
My garden art is made with a high-fiber content/high-strength concrete mix and stained with commercial outdoor concrete stains which I use like watercolors. They can live outdoors for years and can be placed almost anywhere but will fade eventually in full sun. Leaves and tiles are cast in polyurethane molds - leaves I have crafted from real leaves and tiles are hand carved in clay. Larger leaves are installed with custom bases.
This is the largest mold I have made, 30" across and quite complex to make but polyurethane is amazing material and, with the right methods, you can create durable molds for casting concrete.