Cereal boxes turned mail sorters (covered in wrapping paper) and attached to the wall with velcro! I thought this would be neat in the classroom - organize different kinds of paper, handouts, etc. Or use as mailboxes for the parents.
Shoe Hanger Storage for Student or Teacher stuff. This will work prefect for homeschooling, make use of coat closet and out of sight when school isn't in session. :) You could even have one for each child with each pocket for a different subject.