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I have my own home theater set up, and in the closet with the movies and games I keep all of the boxes from electronics purchases.

Boxes:
iPhone 2G: 8GB and 16GB
iPhone 3G: White 16GB
iPhone 3GS: Black 32GB
(June 24th) iPhone 4: Black 32GB
2x MacBook Air (1st gen)
3x MacBook Aluminum
MacBook Polycarbonate
MacBook Pro 13"
MacBook Pro 15" i5
iPad 32GB WiFi
Apple iPad Case
Mac Mini
Airport Extreme
In-Ear Headphones
XBOX 360, PS3, DS Lite, DSi, PSP, etc...
Camera gear (Canon EOS, lenses, etc...)
Random other stuff.


Basically, I need 10 shelves for boxes alone. But at some point it had become a cool way to decorate a small and personal home theater.
 
I unintentionally kept the box to my very first phone which was a candy bar Nokia from Cricket. The best part is the box exclaiming about it's voicemail feature. Text messaging wasn't even possible on this phone. Crazy.
 
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