The rugs shown above have been created from straight stripes (not spiraled) and are available to buy: (click on the thumbnail for a larger image with details)
Striped rugs are simple to knit, once the color management and shifting has been worked out. Some of these rugs have more units than you might recognize from first glance.
The hand made rag rugs below have found their home with a collector:
Any of these can be used as starting points for a rug made to your specifications. However, because the rugs are made from recycled tshirts (among other fabrics), they can never be exactly duplicated.