If you're making all the blocks one square size, remember that the smallest the block can be must be the size of your biggest logo. So measure the length and width of all your logos. If the widest is 14" and the longest is 15", your block must be at least 15.5" square to allow for seam allowance. I make my own templates from heavyweight posterboard, and they can be used over and over again. I just cut the posterboard 2" bigger than the block size, cut the correct block size out of the center of it, and use a pencil to draw the block. Then I use my ruler & rotary cutter to cut the shirt. Clear as mud? I've got one of these for about every size you can think of. Good luck!