I took along some mindless sewing, my bag of selvedges, scrap batting and Insulbrite, a heat reflective batting that protects hands from hot pots and pans. It's available at Joann's [use a coupon!] Hobby Lobby and other fabric stores.
I now have another seven of these cute pot-holders, even the binding is selvedge. My favorite is the red,white and black, the rest are very much an eclectic mix of color and designs.
I used the "stitch and flip" method utilizing scrap batting for the foundation on either side then enclosing a square of Insulbrite in the middle. At the end of the binding I make a loop and fold it back on itself and secure it to the edge with a couple of rows of stitches. As I said, mindless sewing, they go together very fast and you can chat and not pay attention to what you are doing!
This method works well for any leftover strips of fabric too narrow for other uses, as small as one inch-less than that is not worth sewing. Try a couple they are addictive, they make charming hostess gifts especially around the holidays along with a plate of cookies anyone can use another pot-holder!