I'm in to process of making a t-shirt quilt using all different sized shirts and designs. I cut out the design, ironed on interfacing and trimed to fit the design. Then I cut & sewed sashing on the sides measuring to make them all 18 inches blocks. The sashing is all different sizes to fit the t-shirt designs. So far it's not looking too bad. It's kind of a pain to make eash sashing different sizes. I did them one at a time to avoid being confused, but it worked.