This card is called an Exploding Diamond card and I got the instructions here. It folds down to a 4 x 4 square and would be very useful for all sorts of occasions. It lends itself quite nicely to be turned into a cracker card. My only suggestion when making this card is not to use too thick card stock and not to score the card at 6", just mark it with a pencil.
The image is from Crafters Companion and the backing paper is from PaperArtsy called Rum N' Raisin.
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