“The artists behind Anonymous Postcardhave created a website with real-world applications. You send a suitably interesting message of complaint or congratulations. They create a one-of-a-kind postcard and mail it to your chosen recipient.

Fed chairman Ben Bernanke received an encouragement card fashioned from a $5 bill. Former governor Rod Blagojevich’s card was crafted out of a hair-product container. And the message addressed to “Moms of Mill Valley, CA” — asking them to control their bratty kids — was printed, none too subtly, on an empty condom box.”