We save some of our Halloween candy for this crazy gingerbread art project. They always get sugar high. It's always insane. But it's so much fun, too! Last year we found a kit at Target that had "mini" houses and I liked that much better than one big one. We each made our own masterpiece and set them up in a village.
I have a friend who did gingerbread houses using graham crackers with our preschool class and the children LOVED them.
This year I am thinking about turning our Fort Magic into a "gingerbread house" - kind of like these cardboard gingerbread houses but using Fort Magic and some brown felt (and other felt for the candy embellishments).