If you’d like to send affordable holiday greetings to customers, clients, and prospects, and also promote your brand in a friendly, humorous way, you might not find a more emulatable idea than what Burger King has put together for an online greeting cards campaign. Each card can be ordered online, with a $1 bill tucked inside. You can choose from a large array of cards along a ruler that lets you choose (in jest) varying degrees of casual friend or virtual stranger. Our favorite cards says, “Merry Christmas online friend #344.

To take a gander, and perhaps send a greeting, here’s the site.