What would you make out of a card board box?

So, I recently saw a craft blog where they showed all kinds of cute ideas for making things for kids to play with out of cardboard boxes. There were houses, towns, planes, trains and automobiles. My kids got their hands on a water softener box today and made.... An out house! Complete with a pot to well, you know. They had a lot of fun pretending (thankfully) to do their business and then knocking the out house over on each other. So just a heads up to post a guard outside the portapotty if my kids happen to be near by next time you have to...well..go in one.