I just love crafting with bike inner tubes! If you don't have any broken ones just ask in the nearest bike store, they will sure have some! :)
My little sister made this bracelet :)
you need a cleaned inner tube from a bike.
You need scissors, a pen,..
.. some yarn and a needle.
And you need pearls. My little sister took 4 pearls that looked the same, but it propably would also look really funky if the pearls are different :)
cut the inner tube in a zic-zac shape (sorry, no pic from this step!)
The easiest is if you first draw the shape on the tube.
With a needle pull the yarn through the tube...
In the end, just make knots to the end of the yarn and attach the pearl.
there you go, you're ready :)