The leaf lamp from Fab Art DIY is the most detailed use of discarded bottles.
Photo of Leaf lamp from Fab Art DIY, http://www.fabartdiy.com/diy-leaf-lamp-shade-from-plastic-bottles/
This DIY plastic bottle holder is beautiful and functional.
Photo from "Cool Creatives."
Instructions are at, http://coolcreativity.com/handcraft/diy-plastic-bottles-holders/
Reuse your bottle to garden. Directions are available at "Instructables."
Photo from "Instructables."
"Crazy Russian Hacker also has some great ideas, plus a very cute dog in the video.