to frugalfabrics. Your tutorial quite good. As a teacher, I always scan a pattern before attempting. Well done. I do want to add a few points. If t-shirt logo is not large enough for your method, you can put two or more together to make the 12 1/2" block using sashing in the block itself. Have made a half dozen of these wonderful quilts. Also, you can press the front of your quilt if you place a pressing cloth or applique sheet over the "gooey" logos.
Congrats to you for getting out some basic instructions to all out there .