1 tin lunchbox + 1 Zotac ION = portable pwnage.
I tried to keep the form factor small so decided on laptop components. With dual 40mm fans and using the supplied CPU fan, it should stay nice and cool with options for LED lights.
Just about any tin lunchbox can be used - this is based on a popular 8 5/8" x 3 3/4" x 6 3/4" - No thermos. So go crazy with the color and graphics - you can even use an old retro lunchbox if you want!