The internet tells me that many, many other people in this world have literary tattoos. (However, I very much cast aspersion onto the Literary Value of that second tattoo down on the first link: really, is that first identifiable as a Palahniuk cover? Wouldn't it be most commonly associated with, say, anatomical diagrams from high school anatomy & biology? Also, from the contrariwise.org link: please never again consider Dave Matthews Band lyrics a "literary tattoo".)
The internet does seem to come up blank when faced with the search term "Joan Didion tattoo", or "Slouching Towards Bethlehem tattoo", though.
So, do you have a copy of the 1968 printing of Joan Didion's Slouching Towards Bethlehem at hand? Good, because I do not. (All my books are in another state at this time, and I am not about to drive seven hours to scan a page to illustrate my point.) Turn to the first story, "Some Dreamers of the Golden Dream". See that beautiful inky graphic that is the chapter heading graphic? Yes, that's what I have dreamt of for ten years now as a potential tattoo. In fact, that's the only thing I've ever dreamt of as a tattoo.
Will I ever really go for it and get this inked on my breastbone? Perhaps. Slouching Towards Bethlehem is one of the very first books I read that made me gasp and realize what, exactly, great writing can do to a reader. And really, if someone can make the decision to get something in fucking Elvish permanently affixed to their skin, I think Joan Didion will prove the far saner choice.