Sometimes I take the blue box and an assortment of other boxes (like dry cereal) and using glue I make a desk organizer. You can cover it with construction paper (or not) and you can label the containers. Sometimes I just put one together for sorting. You can also use this to invent little funny games and mazes (rainy day projects).
You can also decorate one and put it on the bedroom door for messages...etc.
This is just the tip of the iceberg for my blue box crafts.
We totally covered Mac & Cheese in another thread. So this must be the thread for the box.