A week or two ago after breaking it to the kids that the little pile of scrap wood they scrounged up wasn't going to build their dream tree house I got to thinking. How could they have a fort with out buying one? Cardboard was the answer! I searched Craigslist and found free cardboard sheets. I used the hubby's truck to pick them up and dropped them in the pole barn. The next day without me telling them what it was for the had built a "fort" and right now I have an "airplane" in the backyard. Yes its messy looking and but as soon as I can't take it anymore and they are sick of "building" we'll either burn it or recycle it. Hours and hours of fun or the about the cost of a gallon of gas- perfect!