In the never ending glory that is the internet, a very cool site I've found is "Pimp That Snack". Here people take everyday snacks and document how they've pimped it, i.e. disassemble it, work out what goes in it, then make a massive version of it, documenting their work the whole time!
Some of the best ones include Jaffa Quake (done by the posh food critic from The F Word):
And the GIANT Oreo (which I have to say looks mighty impressive!)
Started in April 2006, when Pete (aka Pimp Daddy) bought a Peanut Butter Kit Kat and decided to reassemble it by replacing the Peanut Butter inside the bar with some store bought variety. After documenting his triumph on a website, he received a lot of interest, and he turned the concept into the PimpThatSnack website.
Each project has details and pictures of how they were constructed, and makes for some really fun reading. Some of my other favs are the giant flake, and the giant alphabet soup (though I only really like the noodles, as I never liked the yucky tomato soup it came in anyway) and the giant chocolate digestive.