I just put these coffee cup cozies in my shop. One little part I can do for our Earth.
The denim ones are made from old jeans. An equally frugal-minded crafter gave me a huge tote full of beautiful denim pieces. I keep one in my purse all the time and use it instead of the paper ones. The baristas all think they're cute, and I have actually sold some to a few coffee shops in the area.