The bricks used in this building in South Delhi have been recycled with a little mud and a little sand. They're customized for use in this new eco-building, which is designed to use 40% less energy.
Broken tiles from other demolished buildings are used on the roof, as are solar panels for energy. The piping is designed to reduce water waste. The engineers claim that the maintenance costs will be 30-40% lower than a traditional building.
Great step in the right direction, because the newscaster tells us here that it is estimated that houses in Delhi use more energy than cars and trucks!