I do a lot of small hand piecing and quilting projects. My favorite reuse is the boxes that Little Caesar's cheesy bread comes in, (my son loves it). If they aren't soiled I cover them with contact paper and use them to make project kits. They stack nicely, and I can stick a label on them that I can easily remove for the next project. I also use the small Fancy Feast cat food boxes for sorting scraps. My kitty loves her Gravy Lover's Grilled Chicken so I have a ton of them!