Use them in a building, like the Shanghai Corporate Pavilion by Atelier Feichang Jianzhu.

The exterior structure is composed of hundreds of polycarbonate transparent recycled plastic tubes formed into a grid-like matrix. Recycled from used CD cases, the polycarbonate tubes will be able to be recycled again at the end of the building’s life. Multi-colored LED lights will be built into the exterior structure and be computer controlled to change the appearance of the exterior on a whim or based on a computer program.

[To the tune of Giorgio Moroder & David Bowie, “Cat People (Putting Out Fire),” from the album Cat People (I give it 3 stars).]