Use zippered pencil pouches to organize puzzles instead of storing the bulky boxes. Cut off the image from the front of the box and store it in the bag, too. (This blog post has several great ideas for organizing kids toys.)
Vacation memory jars by Martha Stewart Crafts. I'd love to have one jar representing each summer vacation lined up on a bookshelf. Would have to make a conscious effort to alternate destinations every year, so the jars right next to each other don't look the same.