This is an Instructable on how to make yarn out of used bicycle inner tubes- perfect for everybody who has ever thought that their jumpers aren't rubbery enough.
Dead bike inner tubes are in abundance, ask your nearest bike shop or community bike workshop to give you some.
Not only can you knit (or crochet, sewing or whatever-else) for free, but you are reusing a waste material.
It is inspired by my favourite Instructable by Marcellahella- Knit With Inner Tube Thread
I have a few adjustments though, I feel my method makes the yarn a bit stronger.
You will need:
1 dead bike inner tube.
Scissors. (Not your best ones, this will blunt them rapidly.)
Piece of scrap cardboard.
Wooden knitting needles. (Preferably wooden but not essential.)