To make a pop-up Christmas card, you will need some cardstock or heavy paper, scissors, glue, and any decorations you would like to add. First, cut out a square or rectangle shape from the cardstock. Then, fold the card in half and use a ruler to measure and mark a line in the center of the card. Next, fold the top half of the card down, creating a triangular shape. Now, unfold the card and use the lines you marked to fold the sides of the card inward.