Chain 6, join the end to the beginning with a slip stitch
6dc into the circle
Ch2, 2dc into each dc from the previous row (12 dc)
Ch2, (1dc, 2dc) repeat around (18dc)
Ch2, (1dc, 1dc, 2dc) repeat around (24dc)
Continuing slowly increasing by working a dc in every 4th, every 5th, etc stitch until the rug is large enough or you run out of strips.
Need to learn how to make tshirt yarn? Check out my previous blog post http://denknits.blogspot.com/2016/09/turning-tshirts-into-yarn.html?m=1