To recycle an old towel into shorts, fold the towel and cut it into a short leg's length worth of fabric. Cut another piece into a short leg's length worth of fabric. Draw a curved seam on one edge. Stack the towels and pin them to hold the fabric in place. Cut out the seam on both of the towels. Separate the towels and sew up the seams on both of the fabric pieces. Do not sew the top seam and front side seam of the shorts. Instead, sew the front and back side seams together. Thread and sew a string through the top of the fabric to create a drawstring. Flip the shorts inside out. The shorts are now ready to be worn and enjoyed.