Applied by Tomas at Tattoo Paradise on 18th St in DC (no clue who did the original drawing). I got it because I think it looks cool. Added bonus: it's in a spot where I can roll up my sleeves twice and still not show it, so it's pretty SFW (not that it matters in my current job).
I have two more planned, but I keep dragging my feet because I won't be able to give blood for a year after that. I could always go across the river to NJ to get one, and I'd only be deferred from donating until it's fully healed, since that state health dept. regulates tattoo parlors over there. But then I'd be getting a tattoo in New Jersey.