These bags look so soft and worn in AND I think these (above right) "flours" are darling. Both can be found here, where all material used is recycled or resused. There is also a tutorial on how to transform your flour sack into an apron!
If you're feeling really adventurous, try upholstering a chair with a feed sack ~ found here.
Or for those who want something a bit simpler might be inspired by these pillows found on Etsy