Seinfeld used to do a bit about how the Black Box was the only indestructible part of an airplane, a design oversight in his estimation. "Why don't they just make the entire plane out of the Black Box?"
The closest you'll ever get to seeing such a thing is a car made out of seatbelts, or at least skinned in them. Artists Ann Conte and Jeanne Wiley covered an MG Midget in a weave of overstock seatbelt material and crafted seats made of Corian donated by DuPont, among other tricks:
[The Woven Car is made from] recycled and overstock materials, including pale gold seatbelts that were woven to create a checkerboard pattern around the body of the car, and 500 yards of webbing that was adhered to the shape of the car. The car's stick shift is a bouquet of hollow ceramic flowers that were created by dipping live flowers in paper clay. The flowers were evaporated in the heat of the kiln, leaving a shell that was glazed. The tail lights are also ceramic, featuring 60s-inspired orange, yellow and red prints.