Hello I was happy to see a Christmas card where the letters were made by Japanese school children out of folded origami paper.
A photo of the card (heavily photoshopped) was the basis for my own Christmas card.

There are online instructions on how to construct such letters, although the card I saw followed other patterns. Origami paper is square, colored on one side and usually white on the other. Have fun!
http://www.origami-club.com/en/abc/index.html