Make your geeky love a pixel-y card for Valentines Day! Here's a thorough tutorial, including helpful graphics and a downloadable template.
FYI: The only thing the instructions lack is what it means to "score" paper. Here's a video that shows how, though I usually use a letter opener or large paper clip to score. Anything that is hard, has a fairly fine point, but won't cut clear through the paper will work. If your paper is very thick, lightly cutting through just the surface of the paper will work, but for medium weight papers, all you need to do is bruise the paper fibers where you want them to bend.
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