I love the idea of having a different kind of border other than a punched or lace border on my cards. I saw a tutorial on making the box pleats, but it was kind of hard to understand with just the pictures and a written explanation, so I hope a video might help you now that I got it figured out :).
This would make an excellent border for scrapbook pages too, you could just tuck the next length of paper underneath to continue on with your design.
The box pleat scrapbook paper is cut at 1.5″ wide x 9″ long. This is enough to go across the width an A4 card (4.25″). I added a doily, tag, bow and lace to finish off this card. Hope you enjoy this project!