I found an interesting wind harp design at this website . Wind Harps or more correctly called an Aeolian Harp is played by the wind. The wind causes the string to vibrate and if several strings are tuned to the same pitch, these sounds reinforce and modulate between themselves. The resulting sounds create a serene and peaceful melody. Such an instrument can be made with PVC pipe and nylon fishing line. The above website has a list of materials and full instructions on how to make one.