I have four tattoos, but this is by far my favourite:

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My next tattoo will be my Slytherin crest on my right hip. I want to get it in the Pottermore style, and it looks like this:

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I've also toyed around with the idea of getting "matching" tattoos on my wrist: the White Tree of Gondor on one, and the Evenstar on the other. I'll probably end up getting a leaf of Lorien on my right shoulder, though.