Don't leave your 2 1/2 inch squares unchaperoned!
A few years ago, I cut up all my scraps into 2 1/2 inch squares for a quilt pattern I had. Fast forward a few years. I have made 2 full size quilts, several table runners, tote bags, and just this past week, I have sewed 1000 of those little buggers together. I have barely made a dent in my collection. I think they are reproducing when I'm not looking. So if you have a collection, keep an eye on them.