In a similar vein, the world is full of musical instuments that haven't yet been realized. One of these is the kaval, a type of end-blown flute played all over the Balkans. When I lived in Turkey, children I knew would make these flutes out of "bor" - plastic tubing used for protecting electrical cables that could be found discarded at construction sites or bought at bulding supply shops. Making a kaval is quite simple. Playing a kaval is a bit harder. You can find instructions for doing both of these at my "Make your own kaval" page.
Fans of the kaval might enjoy listening to Bayram Şengül and Theodosii Spassov, two of the finest players on the scene today: