Also on these boards
Display Dynamics - Perfect Paper Stackable Paper Trays - 12x12 - Lipped - 10 Pack at Scrapbook.com $59.99
A box for each kid K-12 ... I had a professional organizer at my house (what a treat!) and she suggested this system for pictures and papers, etc. 1st year, 1-2, 2-3, 3-4, pre-K, K, 1st grade - 12th. So simple, but so brillant.
Darice® Vertical Paper Holder for 12 x 12 Paper Storage $6.97 at consumercrafts.com
may need more of these for my paper....