For this project I'm using the rubber button insert that you get inside calculators.
Use scissors to cut the buttons in to strips. Individually cut off any larger buttons.
Use a pin to pierce a hole at the end of a rubber strip.
Slip a jump ring through the hole.
Attach a clasp to the the end jump ring and close it.
Attach all the button strips together in one long chain.
Attach a single jump ring at the other end of the chain.
Your bracelet is now ready to wear.