I had a bunch of old white cotton t shirts I was going to throw away, but I decided to turn them into yarn, and knit a rug! First, I used black dye to turn them grey (I meant them to be black but I guess I didnt use enough dye). Then I cut them up with a rotary cutter in a spiral to have one continuous string. Then I connected them and wound them into yarn. Its a very long hard process, and this is a picture of my progress so far. Not very pretty, but it will be very useful and really washable!