I am doing my son's class and we are going to use cereal boxes. You cute to flaps off the top and then cut about 3-4 inches down the sides. Glue construction paper to them and let them decorate them. Punch holes in the top and put some string through to make a handle. Very cute, very cheap, and very easy!!
Kleenex box and some Dixie cups glued upside down to the top. You may have to cut the cups down to get the right proportions. Paint or cover in construction paper or vinyl adhesive paper if you can find the right color.
I made a Lego cake for my son's birthday party a few years ago. The boys thought that was really cool.
How about the big lego (or duplo) just glue 'em together.
<font size=""1""><font color="#"black"">Liberalism is not an affilation its a curable disease. </font></font><br /><br><font color="#"gray"">~Wisdom of Shawnshuefus</font><br /><br><font color="#"blue""><font size=""1"">The punishment which the wise suffer, who refuse to take part in government, is...