Club Nintendo in Japan has been updated with a new reward for cashing in those Nintendo products: a giant alternate-reality card for 3DS.
It's 73 x 46 cm, which is a heck of a lot bigger than the cards packed in with the system. One side outputs your Mii, while the other does Mario. I desperately want this to become available to North America, even if it is just a glorified piece of paper.
If all else fails, I guess we can still totally fashion our own custom AR cards, as evidenced by this insane video.
Giant 3DS AR Card Available at Club Nintendo [andriasang]