Recently, while doing research about envelopes because that's the sort of thing that I do, I came across this website. It is a site devoted to hosting free downloads of foldable stationery, specifically for the "Florentine" fold. The site's host and designer, Alex, makes the following arguements for the desirablity of this particular style of origami for envelopes:
- It holds itself closed and is secured by the stamp
- It's easy to secure the letter even further with a dab of glue or a short length of sticky tape
- The folded envelope is impressively large compared to the size of the original sheet
- All of the folds are at 45 degrees, which I find to be quite aesthetic
- The fold works well on a variety of aspect ratios and is resistant to scaling
- You can write on the full area of one side of the letter
I'm convinced! Here's the link to the downloads and the site also allows you to design and upload your own. Pretty nifty!