This is my first Instructable, so please be kind!
I will show how to build a Christmas popup card that features a Fractal decomposition of images. You can fit your personal photos and pictures, so that the whole renders as a Christmas tree.
It takes about 1 hour to prepare the card (I did it on PowerPoint, and the file is available if you want to start from something already half-done).
For each card the cutting/folding is about 10 minutes per card. I sent about 12 of them, only one fooled up.
Step 1: The powerpoint template
I did the card mostly using PowerPoint. Once the basic template is done (you can download a blank one without pictures here) it is very easy to make it yours, and add you own photos to it.