The amount of philanthropy associated with crocheters is amazing. There are countless sites developed for charity that host a plethora of free patterns for items that can be made and donated. Every once in a while there is one that goes a bit further. Darn Good Yarn is one of those.
Made from the scraps of sari manufacturing, Darn Good Yarn provides women in India and Tibet a source of fair income. They bring the scrap from the manufacturing process home, sew it in strips and spin it, then sell it to the co-op. Darn Good Yarn takes it from there and distributes it to the world. It's a terrific "no waste" idea applied to clothing manufacturing.
Although I have never personally worked with it, I have had the opportunity to see and touch it. It's best described as a super silky kind of ribbon yarn. Large projects with ribbon yarn tend to end up quite heavy, especially if you tend to crochet tightly, so I would use it as an accent or trim on apparel. The bright and rich colors of saris are part of this unique yarn, so it would work wonderfully in this regard. Their website offers free patterns for both crochet and knit, and can be found here.
If you would like a chance to try this yarn for free, check out http://www.allfreecrochet.com/index.php/hct/Book-Reviews-and-Giveaways. While you are there, browse through the site. All Free Crochet is great for inspiration, free patterns and crochet tips.