Crochet Inspiration - Colorful Rag Rugs

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What could be better for my first crochet inspiration post than these beautiful crochet rag rugs made by Rose Beerhorst? Each rug is made of 100% recycled materials like t-shirts and colorful cotton sheets. She sells these and other crafty goodies in her Etsy shop, Sock Monster.
For months, I've been wanting to give t-shirt yarn a try. I think a rug like this would look great in my kitchen and make washing dishes a little more enjoyable. 
Have you made yarn with t-shirts or sheets before? How did your project turn out?