Cut pieces of wool fabric into strips measuring approximately 4 inches wide and 24 inches long.
Sew the ends of the wool strips together using wool thread to create three long strips that each measure 72 inches long.
Pin the three long wool strips together at one end using a safety pin.
Braid the three wool strips together, and then pin the other end of the wool braid using a safety pin.
Wind the wool braid into a 12-inch wide oval coil, and then pin the coil together along the seams using safety pins.
Sew the oval coil together along the seams using wool thread. Tuck the end of the braid underneath the coiled rug, and then knot the thread on the bottom of the rug. Trim off any excess thread with scissors. Remove the safety pins.
Cover one side of the wool rug with a thin layer of fabric glue.
Cut a piece of nonslip backing the same size as the stair rug, and then press the backing onto the glue-covered rug. Allow the glue to dry for 30 minutes, then place the rug onto one of your stairs with the backing side down.
Repeat to make as many stair rugs as you require.