I have two tattoo's. A dove with an olive branch which reminds me of God's peace and fulfillment of promises, and a celtic know with the letters VXV standing for verse by verse bible studying, kind of the idea of this is where I find meaning.
I read a story about a guy who found God and felt God leading him to get tattoos, and he never cared for them before he was a christian. Since getting saved, and getting bible verses and things like that as tattoos though, he would find himself in a difficult situation, and find a bible verse on his arm or something that would be exactly what he needed to get through that time.