From WikiHow:
One of the first things that herald in the Christmas season is greeting cards. The shelves are stacked with boxes of varied, assorted and made to order cards, ready to be signed and mailed. Imagine for a moment how wonderful it would be to personalize your cards this year, and make your own Christmas tree pop-up card to send to those special friends and family on your list!
Steps
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Click the image on the right and then print out the full size image on a heavy paper, like card stock or construction paper.
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Print out the image on the right in a similar manner with heavy paper.
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Lay the card that has the outline of the tree on a flat surface.Take a ruler and line the edge of it up against the center fold line of the card
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Use the rounded end of a paper clip (or a ball point pen that has run out of ink) and press it along the dotted line carefully scoring the card all the way from top to bottom. Score all the other dotted lines on the card as well.
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Cut the card out carefully following the solid, black lines around the edges.
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Begin to fold the card in half, keeping the outline of the tree on the OUTSIDE so you can always see it.
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Fold the card completely in half with the outline of the tree still visible.
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Carefully cut along the solid black line of the first segment at the top of the tree.
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Fold the first segment at the top to the tree back against the card, along the dotted line, and crease with your thumb or finger.
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Put the first segment back in its original position.
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Open the card like a tent, and push the first segment through to the other side.
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If you turn the card over, this is what it looks like.
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Turn the card over again and carefully cut along the SOLID black line of the second segment at the top of the tree
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Fold the second segment at the top to the tree back against the card, along the dotted line, and crease with your thumb or finger.
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Put the second segment back in its original position.
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Open the card like a tent, and push the second segment through to the other side.
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If you turn the card over, this is what it looks like.
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Turn the card back over again and repeat the same process of cutting along the solid black lines, folding the segments and pushing them through to the other side. When you have done all five segments the card will look like this.
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Set the Christmas tree card aside and lay the second print out, the backing card, on a flat surface. Take a ruler and line the edge of it up against the center fold line of the backing card and score down the center with your paper clip.
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Cut the backing card out carefully following the solid, black lines around the edges.
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Fold the backing card in half with the dotted line on the INSIDE. Set this card aside.
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Turn over the Christmas Tree card so the dotted outline is visible. Put a thin line of glue along the right side of the card from top to bottom.
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Put a thin line of glue along the left side of the card from top to bottom.
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Carefully position the backing card, with the dotted line facing down, on top of the Christmas tree card. Take your time, making sure the edges of both cards match up.
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Press the cards together, flattening them completely.
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Turn the card over, carefully close and open it. Your pop-up Christmas Tree card is ready to be decorated!