When I am marking my blocks with row markers - I purchased template material and cut it into 1" squares. Then, I used my paper punch to punch one hole in the center. I used a sharpie to mark each row/block -- 1-1, 1-2, 1-3 (row 1, blocks 1, 2, 3) under the hole. Then I place them in the upper left corner of each block using a straight pin - in and out of the fabric through the hole. Then you can pick them all up and never have to wonder how you had them laid out - never get one in upside down or whatever because they have all been placed in the upper left corner.