I love to use things from the office supply store. My sewing room has two 2-drawer file cabinets I use for storing books, patterns, magazines, tips, etc., so I have lots of file folders, hanging folders, and dividers. I also use storage containers and other items I purchase at the office supply store. Another idea is the scrapbooking section of the local craft store. I bought several 13" square clear snap-top boxes which are 2" deep--perfect for WIPs.