When I made my T-Shirt quilt I had many different sizes, and put them out so I could see then and arranged them large on the bottom and small on the top. Then added fabric to fill in between them. My T-shirts had an image on the front, and one on the back. So the large back ones went on the bottom of the quilt, and the small ones went on the top. I used T-shirt fabric, and cotton fabric to fill in. Then free motion quilted it. Some of the images were animals and I wanted them to be outlined. And changed thread colors often.