Personally, I'd never get a tatto. I don't like them and I think they're ugly and stuff, and you can't give blood, if you ever want to. Frizzle, that sounds cool, but take into account what it'll look like then you get old 
There is only a 12 month deferral on donating blood if you get a tattoo (in Australia anyway).
lmao @ what a tattoo will look like when you get old - reminds me of those chicks who get tats on their bellies or boobs ... and then have kids and it all goes south and stretches right out!

(suddenly that pretty little tat of a dolphin turns into a wrinkly old whale!)
I personally won't get any tatoos - I'm so terribly indecisive that if I ever COULD decide on what to get ... 6 months later (or probably 5 minutes later

) I'd turn around and want to get rid of it cause I hated it.
I have seen some great tattoo art though ... I've even designed a tattoo for a mate of my ex-boyfriend. A dragon (head & neck) who's scales transformed into a Celtic design and then Maori design. It turned out alright, I wouldn't say it was the greatest work I have ever seen ... but then I usually hate all my own art so