I haven't read every single reply here, and maybe this has been said, but there is a great book - "Scrap Therapy - Cut the Scraps" by Joan Ford. She has a system where she cuts all her scraps into 2", 3-1/2" and 5" squares. When you think about it these sizes can be combined into tons of different blocks. I recently spent a week cutting all the scraps I had stored in a clothes hamper into these square and now they are all neat and tidy and waiting to be used in some great scrap quilt. Now when I finish a project, I cut the scraps into squares right away (if they're smaller than a fat eighth) and store them in the appropriate boxes and I'm all set!