I got a refund from Blue Shield CA- YES that is not a typo- a refund surprise!
Surprise #2- this awesome diamond pattern! I like how there is a plus inside each diamond.
A collection of security envelope patterns. Profoundly nerdy I know, but I find the pattern so cool, like a little surprise when I open a bill or flyer or have to mail something back. Did I mention I'm a textile designer? Look at your own envelopes and see what you find!