Check out "The Too-Cool T-shirt Quilt" by Andrea T. Funk. You do not have to use a stabilizer under the shirts, so saves you time. She also shows you how to lay out the shirts when they are not all the same size. DD made mine using this method. She has made 7 or 8 more for family/friends. She is becoming known as the T-Shirt quilt maker in our area.
Here's mine.
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