I have had so much fun making pop up cards using instructions from the Wikihow website. The reindeer, the angel, the Christmas tree and the poinsetta are so colorful and (dare I use that word) CUTE!
Since I have done them several times, I have added my own twists to a couple of them. For instance, on the poinsetta, http://www.wikihow.com/Make-a-Poinsettia-Pop-up-Card I cut-and-pasted both templates and printed them on one piece of red printing paper. I then did a cut-and-paste and printed the second template on one piece of green card stock. I cut out the double-pointed-end shape on the red template, folded it in half and glued it to the green template over the same shape. I then proceeded to tape the other pieces as per the instructions.
The reindeer card is probable my favorite. http://www.wikihow.com/Make-a-Reindeer-Pop-up-Card I printed the templates out on dark brown construction paper. After I cut out the pieces and before I glued them in, I pasted a small piece of red on the reindeer's nose and inked in some eyes.
The Christmas tree (http://www.wikihow.com/Make-a-Christmas-Tree-Pop-up-Card) and angel (http://www.wikihow.com/Make-an-Angel-Pop-up-Card) beg for glitter. I make the tree on green card stock and the angel on white card stock. The angel would definitely be easiest by cutting first, then glittering before gluing. I used my three hole punch and scrap pieces of white, yellow, red, and blue to punch out "ornaments" and then glued them to the tree after the card was glued together.
I hope you have as much fun making these cards as I did.