My son was recently invited to his first personalized bar mitzvah. After asking around, I quickly found out that money was the desired gift to bring. I guess that makes it easy, but at least I wanted to make the packaging a little fun. So I came across this website and started folding. 
It was quite easy and the folded in half rolled up bill fit in nicely.
My son had a nice time, and I hope his friend enjoyed his special day and gift. For a different occasion I guess the box could hold a piece of jewelry too ?! Or some candy ?!