Roofs that hold water: reduce heating and cooling costs, increase life of roof, and create a rooftop garden! Would be great on a shipping container home, as there might be a risk of collapsed roof otherwise if drainage isn't sufficient.
Wood crates can be found in many home. They are perfect for making of all kinds of furniture. Take a look at these DIY wood crate projects, which are so versatile, functional and decorative for your house and yard.