Well, I suspect you must have used light scraps in your quilts for contrast and just don't have them leftover. I think of it as a leftover meal. If you just had peas and carrots left, you might have to purchase something to go with them, right? Peas and carrots aren't a full meal! Same with fabric. You might have to purchase some lights to go with the darks to make them usable. Just don't over buy, or you'll end up with just lights!