Sand Dollars will group together and gather as many as six hundred in one square meter. Each Sand Dollar can range in color from blues and greens to purples, browns and blacks depending on their species. They will let water pass through their bodies to help propel them and they"™ll go with the flow, but they aren"™t afraid to burrow down and hold their ground either. If you"™re looking to add a little more go-with-the-flow to your home, look no further than the Michael Healy Sand Dollar Doorbell Ringer.