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RAIN CHAIN! This was a store-bought one, but it would be easy to duplicate with rocks and wire. In fact, the Dollar Tree blogger has already done it with, of course, DT items. There is a link in the blog to that tutorial.
Rain chains are a beautiful and functional alternative to traditional, closed gutter downspouts. Guiding rain water visibly down chains or cups from the roof to the ground, rain chains transform a plain gutter downspout into a pleasing water feature. From the soft tinkling of individual droplets to the soothing rush of white water, they are a treat to listen to. They are widely used in Japan.