Diy Light Up Greeting Card . Trace two circles where you want the battery to go. Fold an 8.5 inch by 11 inch piece of card stock in quarters. Stampin' Up Star of Light Stamp Set and Starlight Thinlits Diy from www.pinterest.nz We like to create fun exercises and projects that… Fold one piece of cardstock in half so that it resembles a greeting card. Be sure to separate the two legs so it stays in the card.