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.
Great way to organize kids' art. Bigger drawings and paintings are kept in A3 storage boxes while their special drawings are kept in these ring binders - one for each year (starting from age 3) for each child.