We thought it was funny to print the patterns that traditionally line #10 security envelopes to keep people from seeing their contents on the outside of cards. (It's like wearing your underwear on top of your pants.)
We printed thermographically, so the cards are really as loud (extroverted) as possible. When enclosed within the envelopes though, the show-through mimics a typical security envelope.
stationery for an extrovert—black
B A Z A Z A S
8 cards with envelopes, #10-sized 4 of each security pattern, blank inside, packaged with a 4-way rubber band printed Thermographically in the USA