I finished the rag rug - but it is too short. I thought I was carefully measuring the length on the loom, but I must have blinked or something. It is more square than rectangular - I probably needed to make it at least 6" longer.
Otherwise it turned out fine. I have enough warp to weave a second one. Although I'm not sure I need a second purple and white rug. :-)
The warp is purple and white 8/4 cotton carpet warp. The weft is 1 inch strips of t-shirts. I cut them so that each shirt yields a long strip - essentially cutting around the body of the shirt. This weft makes a strip that naturally curls and wears very well. The last rung I wove this way has lasted around 18 years.
The weave structure is plain weave with the warp colors alternativing. To change the colors, I just place two of the same color together. The stipes of color change in the weft direction by using two shots of carpet warp instead of just one.