To make a cotton rag rug...
Cut fabric into strips...(or you can purchase fabric in precut rolls).
Tri-fold, iron, then sewn into continuous strips.
Once you have your fabric strips ready... crochet using a large crochet hook (I use an "L" or "M").
Patterns for making rag rugs can be purchased at any hobby and craft supply store.
Contact me if you need more information. :)
You can see more rugs at my website:
http://www.tripleecrafterco.com