Plastic

http://www.thisiscolossal.com/tags/plastic/ (giant fish on beach made form bottles)

http://inhabitat.com/robert-jansons-floating-plastic-bag-sculptures-resemble-giant-pink-jellyfish/

http://blogs.worldwatch.org/sustainabilitypossible/just-one-word-plastics/

http://inhabitat.com/eco-art-plastic-bottle-installation-in-nyc/

http://inhabitat.com/aurora-robsons-ethereal-plastic-art-uses-up-to-20000-recycled-bottles/