I once saw the display of the "bangkarwayan" , a creation of the UP professor Benjamin Mangubat.
The Bangkarwayan is a pastiche of solar panels, bamboo pieces, a small windmill and a convertible top boot cover made out of banig. It runs primarily on electrical energy and, when being driven around, can charge its own batteries through the contraptions attached to the car. The car is also flood-proof and will float if flood waters ever reach waist level.