hay /po/ i be /r/ing a papercraft of a cardboard box!
http://rapidsearch.yi.org/?s=cardboy has a cardboard box.So does Snake in a Box and SnakeBoy (some kind /po/rson will upload it)
The one of Shii-chan has a very nice, colored inside and out cardboard box.It's also a completely separate piece from the rest of the model, so you dont have to modify anything.Have a look, why don't you?