A Japanese instrument maker with his trumpet made from a bell pepper and a cucumber has been making its rounds on the internet, so I'll bring a few other interesting instruments from elsewhere in the world. YouTube user 13strings (account currently closed) made an open call: to have everyone show their own home-made instruments on YouTube, and replies have rolled in including the following three: a whole orchestra made from recycled cans and plastic soda-bottles, how to make didgeridoos, a bottle wind and water organ. From another place in the world, an instrument that may not be home made but certainly has a distinctive sound: the hurdy gurdy.
From Brazil, jamilgiudice has at least 5 different instruments made from recycled soft drink cans and bottles.
From Singapore, einrahseinraw blows into tuned bottles, takes pictures of himself and proceeds to mix them up to play Toccata et Fugue in D Minor by Bach: