I cut mine into the biggest size possible. So if the scrap is 4-6", cut a 5 or 6 inch square. You can always cut them down later if you need to. I have never regretted cutting stuff up. It saves so much time when you are ready to put together a project. If I had to stop and cut a bunch of small squares when I was ready to go on something, I would probably just find something else to do!