I have seen a lot of creative uses for old inner tubes, however reader Jonathan from Brooklyn might take the prize for the most inventive use. Take it away Jonathan . . .
I made the "yarn" from old innertubes I got from Bicycle Station, on Park Avenue in Brooklyn. I snip off the valve, then start cutting around (with scissors) the inner circumference of the innertube.
It's easier to show than describe, but imagine the innertube as a bagel; I'm cutting around the hole. Make a very slight spiral so that when you get back to the valve you are cutting a strip of rubber about 1/8" wide around and around. When you run out of material, your skein of yarn is complete.
Jonathan said he made mittens from such yarn - perhaps we will see a future entry with another creative bike related item.