In my class, one of the ladies made 2 T shirt quilts, both queen sized. She cut the shirts to the largest size she could get to show the printing and photo on the front, then ironed on the interfacing. There is a trick to that. T shirt material stretches in one direction - make sure you iron on the interfacing stretching in the OPPOSITE direction so that the t shirt does not stretch while you are making the quilt. After ironing, then she cut the shirts down to size, not before. She made the blocks, then connected them with sashing and the quilts were great when done.