I also use the little round stickers you find at office supply stores, along with a photo on my digital camera. I just started taking some classes from Craftsy and they are great! There is one, Magical Jelly Roll Quilts by Kimberly Einmo, where she demonstrates how to use a chain-piecing technique that encompasses the whole quilt! I always chain piece, but have never seen it done for all rows and columns. The quilt top ends up looking like its all held together by a spider web. Look for it in Lesson 3 of the series where she is teaching the Jacob's Ladder quilt. This avoids all need to label the rows and columns.