We do a Gingerbread House party every year and my talented husband whipped this cardboard house up for the kids in 20min! He used a refrigerator box, cut a triangle on the front and back and folded down the sides to form a peak. (Make sense?) I used paper and leftover felt for quick decorations. It was a big hit - and Asa's still playing with it.
Of course - you could paint it brown and add on a lot more "candy" too!