If not, you should!
My favorite material by far is T-shirts. I just love the look of the rolled fabric in a rug. Besides being quite inexpensive, you get a lot a material from one T-Shirt. I also dyed one of them as well using Rit dye and it turned out wonderfully mottled when done. Don't know how to cut the t-shirts to roll into a ball? There are many You Tube Videos on how to cut a T-Shirt to get a continuous strip for knitting. I hope I have intrigued you to pull out one of your t-Shirts destined for the thrift store and give it a try. Happy Hooking, Maria