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Use a 2-inch (5.1-cm) craft hole punch to cut 5 to 6 circles from the front of a Christmas card. Fold the circles in half, with the design facing in. Glue the front of each folded circle to the back of the next circle to make a ball. Poke a hole in the top of the ornament, then thread a piece of string through it. Tie the ends together to make a loop. Use the step above to make several 3D ornament balls. Use a tapestry needle to thread them onto a long piece of string. Tie a knot to either side of each ball to keep it in place. Tie a loop at each end of the string, then hang the garland up. You can use this method to create garlands for other occasions, such as Halloween or Easter. Simply use cards from that occasion or holiday. Use a pen to trace a cookie cutter onto the front of a Christmas card, then cut the shape out. Poke a hole in the top of the shape, then thread a short piece of string or ribbon through the hole. Tie the ends of the string or ribbon together to make a hanging loop. Reindeer and gingerbread men make great, festive shapes, but you can use others too, such as hearts, stars, or Christmas trees. Cut a 2-inch (5.1-cm) circle from colored cardstock, and a 1 3⁄4-inch (4.4-cm) circle from white, gold, or silver cardstock. Finally, cut a 1 1⁄2-inch (3.8-cm) circle from the front of a Christmas card. Stack and glue the circles together, then poke a hole in the top. Thread thin ribbon through the hole, then tie the ends together to make a hanging loop.  Use circle-shaped craft hole punches to make your circles nice and neat. For a fancier touch, use a scalloped circle punch for the 1 3⁄4-inch (4.4-cm) circle. Embellish your ornament with glitter glue or tiny rhinestones. Choose a set of cards that come from the same holiday or occasion. Cut the front of the cards into 4 1⁄2-inch (1.3-cm) triangles. Glue the bottom edge of each triangle to a 1-inch (2.5-cm) wide ribbon; for a more durable finish, sew across the top with a zigzag stitch.  How long the ribbon is depends on how many triangles you cut and how long you want the garland to be. Leave about 1 inch (2.5 cm) of space between each triangle. Glue a flat, 2-hole or 4-hole button between each card for a rustic touch. For a nicer finish, glue the triangle cards to slightly larger triangles cut from colored cardstock. Alternatively, punch a hole in the 2 bottom corners of each triangle, then weave the ribbon up and down through the holes.

Summary:
Turn cards into 3D ornaments. Make several 3D ornament balls, then string them together for a garland. Use cookie cutters to make Christmas card ornaments. Layer cut Christmas cards with cardstock to make fancier ornaments. Cut cards into triangles, then glue them to a ribbon to make a garland.