I think maybe she is talking about the cash register receipt rolls. I read somewhere that you could use these, then cut the excess off the edges and you would have a straight strip. My grandma and great grandma used pages out of the Sears catalog. Folded one end over to make a square then cut off the excess. Made the perfect block for sewing your strips to. I remember sewing these for them when I was a kid. I've used paper, muslin, scrap fabric (ugly) haha and interfacing scraps.