Hahahaha! Lol. In my opinion, nothing beats this one as far as weirdness and cuteness: http://englishrussia.com/2009/04/08/russian-wall-e-case-mod/
Ok, I sit corrected. The Wall-E case is cooler and I could definately see one sitting on my computer desk BUT, who's got that kind of time, materials equipment and money to spend? Not to mention...........the skills required to design and fabricate all those parts. The ammo can computer case looks as if it's made right into an actual ammo can.
They can be had fairly cheaply from your local Army/Navy surplus stores. I have 2 small ones (7.62mm 200 round) that I paid about $4.00 each for.
I get them from the local flea market. Any size from .50 down to the smallest; even some artillery ammo boxes.
I get them at a local military surplus business. They come in handy for everything, and if you have a jeep, they can't be beat!
There's two surplus stores along US95 in Nevada. One is in Hawthorne (read Hawthorne Army Ordnance Depot) and one right next to the highway in Beatty. The guy in Beatty sells everything from .30-cal ammo boxes all the way up to NVG steel cases and even cases for Dragon rounds and mortar shells!