I chose to use a super bulky yarn that I happened to have in my stash already, though if you have a color yarn you particularly like in a lighter weight, you can always double or even triple the yarn for similar effect. Another good idea is to recover yarn from children’s outgrown sweaters or adult sweaters that have fallen out of favor or are otherwise discarded. Some yarn companies are buying into the green idea and producing yarn made from recycled products…my personal favorite being Red Heart Eco-Ways in Worsted weight, owing to its very modern palette of color choices. And finally, it goes without saying that if you are going to buy new, buy locally produced environmentally produced agricultural yarn.