Though I question the practicality of a plastic necklace, it's cool to see this [1] on the Make blog.
Links:
[1] http://www.makezine.com/blog/archive/2006/06/crochet_necklace_from_recycled.html
[2] http://www.technorati.com/tag/crafts
[3] http://www.technorati.com/tag/crochet