I saw these gift card holders among a bunch of swaps a few months ago (I'm sorry I didn't make a note of where it came from) and I had to make my own version. They are super simple, super cute, and super functional - what could be better than that?!
Here is a version closed:
Start with the base piece (8-1/2" x 2-3/4," scored at 4-1/4"). Apply Sticky Strip as shown below: