In front of my sliding doors, I have this 1 ft by 6 ft layer of little blue and white rocks on my front porch. The rocks are the size of what you normally see covering the bottom of fish tanks. Unfortunately, a whole bunch of twigs, dirt, and other stuff are mixed in with them. What would really be neat is if the wind blows away all the twigs and dirt and stuff, but leaves all the little blue and white rocks.