One Lithuanian guy built a car using mostly polyurethane foam. Just to remind: this material can be found in every room of our house and practically everywhere we go. It is an incredibly resilient, flexible, and durable manufactured material that can take the place of paint, cotton, rubber, metal, and wood in thousands of applications across all fields. Well, in the beginning it was something remotely looking as car, or more precisely a car carcass, so I can’t even say that it was a tunning. The designer also made a cabin of this self-expending foam and installed airbags. The latter, in these conditions, wasn’t so necessary ;)) But what can be a problem is car’s flammability.