Tie yarn to branch in different spots, keeping yarn strands close enough together to touch when the wind blows. Thread shells to the yarn. Add more than one shell to each piece of yarn, leaving spaces between. Thread and knot shells onto other pieces of yarn. Check to be sure shells will bump each other when the wind blows.
Variations Make a chime from chunks of scrap wood.
Ask a frame shop owner to save pieces of framing for you to use for chimes. Tie nuts, bolts, and nails to yarn for a wind chime.