I found these neat flexiable plastic square that keep each row and block number . Example Row 1 Block 1 Row 1 Block 2 etc you can mark 7 rows and 7 blocks across. They have a hole in the center and you just push the material through with you finder and place the pin which keeps it in place. And I think that Fons and Porter have a similar system. I love mine. I am sorry that I don't know who makes them. But I do love the photo idea too