Lamps created from straws and disposable plastic cups !
Awesome wall art from old CDs. Must do a simpler version of this. Also 21 other ideas at the link.
Projector Slide Lamp. I don't have projector slides but I do have tons of old photo negatives and I think they would work just as well. All you have to do is add a small cardstock border. This is awesome.
made from plastic bottles
Cardboard and rope box - Caja de cartón y cuerda - Caixa com papelão e corda