Last year I was obsessed with recycled shirts. Our Salvation army also has 5 for $5 once a week.
Here are a few I made:
http://www.quiltingboard.com/picture...s-t153884.html
While looking for cottons, I found a lot of aloha 100% silk shirts. In Michigan. For $1. Go figure. I've been collecting them for about a year and have almost enough for a silk quilt.