As you can see, making a tee-shirt can be quite creative. If the goal is to get as many tees as possible into the quilt, this last one is a good way to go--cut the designs as small as you can and play with placement to get everything to fit. It's difficult until you get the hang of it. I like to work in chunks and keep a few designs out that I can use as fillers. (I don't cut them until I see what size I'll need.)
Some people create a grid before cutting. If you decide to use this sort of aide, remember to add the seam allowance when cutting and know that you can't deviate from the plan, so measure your shirt designs carefully.
And finally, while you're cutting out designs, keep in mind that it's possible to use any design on a shirt. Pockets, logos, appliques and embroidery can be used in the small areas. To get to a sleeve design, simply cut the sleeve off the shirt and cut seams open from wrist to armpit. You'll be able to lay the sleeve flat.