I like the labels (printed on file folder labels) that some online merchants send. For me, this is especially useful for garment sewing. For quilting, I don't really need them. The fabric content is usually 100% cotton, the fabric line is usually printed on the selvage, and I can tell by the way I folded yardage about how much I bought-- it is going to be FQ or one or two yards.
My goal is to have more strips and squares cut and organized into the carts with clear plastic drawers which I bought a few months ago. I already have a rule that once I cut something from my stash, I have to cut the rest of that length of fabric into strips or backing squares for my drawers. I need to spend my limited time on cutting fabric into usable units rather that fuss with labelling or otherwise organizing my yardage.