I have a butterfly on my back (on the right shoulder) that represents my metamorphasis when I started dating my (now) husband and a pink star on my lower back that I got to represent my new adulthood. When I finally get my bikini body, I have a star/swirl large tattoo drawn out to get on my side, similar to this placement (but not the tattoo)
I like that one, but I think I'd want it to be more vertical on only spread to the back a little bit..