If your house is like most homes, then you probably go through a lot of cereal boxes each week. Recycling them is a great idea, but so is turning some of them into handy office file boxes. You can thank Martha Stewart for this one. All you need to do is take a cereal box and cut away the top part at a diagonal angle on both sides with a utility knife. Once that's done, just wrap the box with some decorative paper or contact paper and you have a paper file folder. Larger boxes are good for books, while smaller ones are best for papers and magazines.