A Rubber Band Bracelet

Add a little square, disk, or ball to your rubber band and it becomes a bracelet. I like the description on Martine Viergever’s website

Wear a plain rubber band around your wrist and make it into a classy bracelet by adding Gummi C. Gummi C is a small series of different shapes in high quality materials such as silver and goldplated silver. It turns an ordinary rubber band into an iconic jewellery piece. Includes 10 extra rubber bands! Simply stretch your rubber band and fit a Gummi C shape onto the thinner part. If your rubber band is worn-out replace it with a new one. Add coloured rubber bands to match your outfit!