Miniwiz created the innovative Re-Case which not only protects your iPhone in style, but also holds your credit cards as well. Miniwiz uses by-products from rice farming in combination with post-consumer thermoplastics (plastic bottles and bottle caps) to form their signature POLLIBER™ material used for the Re-Case. The Re-Case is available in six different colors.
http://earth911.com/news/2012/01/24/this-iphone-case-is-made-from-trash/