You only need one single sheet of paper for this card fold, so grab it an watch this tutorial to learn how to make a diamond pop-up cracker card. Don't know what a cracker card is? Watch thee video and find out what this 3D homemade card is all about. You only need a single strip of card stock (10cm x 29.7cm). So quick, so simple — so make one! This is a great little crd that's easy to send through the post office.