Make DIY Hand Warmers to Warm Up Your Little Paws2. Flip the square right side out and stamp your funny phrase on the front with fabric paint. 4. Whip stitch the outer edge of the square with embroidery floss. We made our hand warmers ranging from five inches to two inches for different sized hands. Thread your needle with embroidery floss and decorate the edges by whip-stitching them.