Kanji Tattoo Designs
One of your main missions in getting a Kanji tattoo is - linguistic bloopers.

First of all, make sure you know something about the Japanese language. Do your research, you have the internet at your fingertips to start. And to complicate things, there are often multiple meaning for abstract concepts.
The only absolute way to be sure you are getting the tattoo you wanted, visit someone who speaks the language. Ask him about meanings of symbols if that is the way your choice is headed.
Kanji Related Sites
Kanji Site | kanji Dictionary