They have a coffee shop in New Orleans where they do that type of art either on top of the coffee or in the froth (depending on what type of drink you're getting). They'll do it as you watch. I can't remember which coffee house it is, exactly, because their are so damned many here and I've patronized most of them. It is possible, but I'll say, the one featured above is either particularly well done or photoshopped.
Cool picture though. It made me want coffee.