WHAT YOU'LL NEED:
Cover each hoop with double sided tape and wrap one colour of the yarn around each hoop covering the wood, leaving a longer tail on the larger hoop. Position the hoops as the picture and wrap the tail around several times to join both hoops neatly. Cut the yarn at the back and secure using a needle and thread.
Using the second colour, cut different lengths of yarn and tie onto the hoops with a hitch knot. Cut the lengths of yarn as desired and hang on the wall.