Hypertufa is a strong material but without all the weight of your traditional concrete. It's durable and doesn't require any maintenance or sealing throughout the seasons. The even better news is that it's extra easy to make.
"Old bicycle wheel turned into a whirligig for the garden.great alternative to a scare crow!" said one pinner. ~ I'm inspired to have the kids paint old pot lids, and attach to the wheel = collaborative art project.