But! Since several people have asked already, let me tell you about my tattoo!
I've wanted to get one for a while, and the exact form of it finally crystallized in the last year or so: The images I'll be basing it on are from the book Sensitive Chaos by Theodor Schwenk, a German philosopher and engineer, who was big (and wifty) into water. Although I haven't been able to find any of my favorite images from the book online, here are several that will give you an idea:
Of course, this isn't just how water moves, but also how, for example, smoke moves, making swirls and twists back and forth. (This is more obvious in some of the other pictures in the book, so you'll have to take my word for it, or grab me sometime when I have the book with me.)
So, that's the general idea, and I'll be sitting down with my tattooist to talk about how best to execute it on skin, and then we'll be making and ankle bracelet out of it.