I make blankets from two different fabrics – flannel and fleece. If you need a light weight blanket just to cover and take off the chill the flannel will most likely do. They are made from 100% cotton in a variety of prints and solids. (If you aren’t picky – check out the Scrappy Blankets in the Bargain Basement.)
If you need a heavier blanket the fleece blanket is probably what you want. They are 100% polyester and made in a variety of prints and solids.