This caught my eye in the gift shop at the Bureau of Engraving & Printing where they print all our bank notes. I didn't buy one but may try to work out how it's folded.
We weren't allowed to take photos during the tour but at one point while watching the production line, I commented on how casually the staff treated the sheets of money as though they were just regular paper. As though on cue one of the staff picked up a wad of sheets, loosely folded them and then proceeded to fan himself as though he were hot. We rolled up laughing.