My only advice would be to choose an artist very carefully. Outside of that, just get what you like. Tattoo collecting and baseball card collecting are very similar in that way.
Here's my pre war tattoo
![Big Grin](forum/images/smilies/biggrin.gif)
Got this one in 2002. It's a combo of "The Babe Bows Out", and a picture of The Stadium in the 20's.