Why buy a birthday card when you can make one? Design based on my original foldable cube and rectangular prism designs which use a single thin layer as a hinge. Check out http://designmaketeach.com/2013/07/26/foldable-rectangular-prism-visual-tinkercad-tutorial/ for design tips on this construction method. I personalized the card design with an inside inscription. The age of the recipient was positioned so that it could be seen through the heart shaped cutout when the card is folded closed. Tie the card shut with a ribbon or design an 'envelope' to hold the card.
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