Fons and Porter did a show on making a quillow not too long ago. It's probably on their website still. They didn't make it out of tshirts, though. You probably just need to use some kind of stabilizer for the tshirts so they don't stretch out as you sew. Then just cut to the size block you want and go for it. I'd like to make one out of my grandson't outgrown tshirts. He's had some cute ones.