I love Boxes and my Cats do too!  I like to use various sized boxes for many storage needs.  For papers and file folders I cut down a Large USPS Priority Box then decorate it with my favorite wrapping paper.  It makes it easy to find mail, magazine, notes, pens and various office supplies.  It keeps the clutter down and I can easily move the boxes with all its contents and best of all they make a great cat bed!  For drawers such as ones that go to a sewing machine I collected various sized boxes and small tupperware containers to store all the lose thread, needles and sewing / craft items.