Cut out the parts and fold them along the fold lines on each. Attach both the front and back covers and you're done! *You can decorate the card or envelope with your favorite stickers, to make your card even more original! First, make a mountain fold along the valley fold line at the center of the base. Then, cut a slot into each of the V-shaped lines on either side. Back cover Christmas tree Front cover Santa Claus Base Craft card: Christmas house card set Envelope