This site has quite a lot of examples
www.tattoodles.comAsking why people have tattoos is a bit like asking why people style their hair a certain way, wear certain clothes, wear make up, wear jewellery, wash - don't think it can be much more than a personal choice about the 'you' you want to present to the world - some people like to look like an accountant, some people want to look younger than they are, some people dress to impress, most young fellas punk up their hair in very strange shapes, some people like to say, here are my tattoos, I think they make look me edgy and I might be hard - don't mess with me - an equivalent of the ten hole doc if you will. (s'my motivation anyway :-)
One small advice I'd give if you're certain that you want a tattoo. It is possible that you think you want it for your own amusment and appreciation and get it done in a place where, in the normal course of things, it isn't visible to the outside world.
Suggest you think carefully, human nature (well mine anyway) is that you tend to want people to know you have a tattoo and for them to see it. Especially in America it's surprising how many blokes you see with their T shirt sleeves turned up or rolled up to show their tattoos - turning up a T shirt sleeve I think is very un cool I think :-) Or you see them adopting strange positions so their shirt rides up to reveal the tattoo - lots of stretching and big movements.
Suggest you carefully choose and then make sure it's done where at least some of it can be seen without having to make efforts for people to see it.
Alternatively, get one done in a hidden place, and if you really like it, go straight back for another one in more visible spot.