I have a small (1" high x 3/4" wide) tattoo of an ankh on my left shoulder. I don't regret getting it, but I do wish two things - 1) that I'd gotten it slightly larger and b) that I'd gone to a more talented artist.
The design is blue and is supposed to make the ankh look like it's metal, but it always just looked kind of mottled instead. Plus the black outline of the design has faded somewhat so while it's still recognizable, it's not at all as nice as I'd like. I've though about trying to have it covered, but I don't know how easy that is to do and I'd hate for it to end up looking even worse.
As for women with tattoos, I'm OK with it. I'm not a fan of the boob tat, or the navel tat though because those are the two I see aging the least gracefully. I'm also not a fan of a girl with large and/or multiple tats. I have a friend who has several (maybe 6?) small tats in discrete locations and they don't look bad, but a large design on a fore arm, back or shoulder is not for me.
I have another friend who did one of the dumbest things I could possibly imagine. She had a huge crush on a baseball player, so after one game she had him sign her shoulder and the next day she got the signature tattooed onto her shoulder.
Needless to say, the following season the guy was traded to another team and the season after that he retired. I'm not sure how she feels about that tattoo any more, but she's happily married now, so I guess it wasn't too much of an issue.
If you do decide to go through with it, tamidala, make sure you find a really good artist and a design you're completely happy with.
ETA: I like the idea of a blacklight tattoo. If I were to get one, I'd combine it with with a traditional tattoo though. For example, get a tattoo of Luke holding a lightsaber hilt, and then get the blade of the saber tattooed in blacklight ink.