Pinterest Fail: Hula Hoop Rug

I stumbled across a pin a few months ago. It showed how to weave a rug from a hula hoop and t-shirt scraps. It incorporated things that I love: weaving, recycling, and kids crafts. So of course I saw it and had to try it.
It was a huge fail.
Since the instructions say to use a cut up t-shirt for the warp too it quickly stretches out of shape. This causes you to end up with a bowl shape instead of a flat circle. While following the how to didn't work out it was a good idea--it just needs to be done slightly different. Instead of using t-shirts for the warp use plain muslin fabric; it won't stretch out of shape causing the rug to be misshapen. Also, I'm clumsy and have slipped on rugs that weren't backed so I'd suggest putting some rug backing on the underside of the rug to prevent it from sliding.
Now that I've gone over how it can be done better, I guess I'll show you the monstrosity I ended up with. D wanted a rainbow rug which I won't attempt again. Even if it hadn't ended up being a misshapen mess I still wouldn't like the thick stripes of color. For version 2.0 I'll pick 3 or 4 colors, cut the strips, throw them all in a bag, and pick at random as I weave.