Usually Lego is a hobby unto itself. But what I really like are projects where the Lego is the means, not the end, where the project succeeded because there was this neato prototyping material lying around. Here are some good one pulled from the cobweb-strewn archives of Make: Online.
Why not have a lego cake and real people on top - it would make a great photo.
Sam is having Lego people on top of the cake.
it would but that would take a lot of lego!