Of course you can print papercraft models from new paper sheets, but you can also recycle old packaging materials, like Meiji shows with their sweets!
The packaging of a Milk Chocolate bar for example can be made into a cute dog, that of Kinoko Choco biscuits into a robot, PickUp cheese snacks packaging into an elephant and lots more!
(and of course you can do the same with other brands if you use your imaginations! ;o)
Download the instructions to make your own papercraft animals from Meji sweets packaging (by Meiji Okashi Land):
(click the "つくりかたをダウンロードする" links underneath the thumbnails for the PDF instruction files)