These graham cracker gingerbread houses are cute, and fun to make. And since they are small, they aren't too complicated. The key to a nice graham cracker house is good frosting. A frosting that is too soft will make the house wobbly, and easy to fall apart as you add other decorations. However, a frosting that is really nice and stiff, and will dry like stone will also be pretty uneatable, so you might want to decide ahead of time if you want to eat them when they are done. I suppose you could also use glue instead of frosting if you don't want to eat them, but most white glues will dry clear, and I think they white joints look nice.
For the graham cracker parts of the house, we used two squares (1/2 of a whole big graham cracker) for the roof, and 4 squares for the sides of the house. I have also seen ones made with 2 small rectangles of graham cracker (or 1/2 of a square) for the sides of the house, and the front and back made by cutting a square of graham cracker into a house shape by cutting the corners off one of the smaller rectangles. When I've tried to make those cuts, it wasn't as easy as I thought it would be. I broke a lot crackers, and became frustrated. They do turn out a little cuter that way though.
TA-DA! Little Graham Cracker Gingerbread Houses.