What do you think of a lower back tattoo?

I think lower backs are just as valid a location choice as any other, and maybe moreso than a few, since it's discreet. The biggest downside is that you won't be able to see it without a mirror or two. But other than that, it's a really feminine and graceful spot for the right tattoo. People who call it a tramp stamp are small minded and judgmental, and you shouldn't listen to them.