I have a lizard tattoo and i don't regret it, but…I'm always trying to work out a way of incorporating it into a larger piece of work and if i had the choice again i would have gone for a far more complex from the off. If you are getting a tattoo for aesthetics, have a look at it on a piece of paper, if it looks like something that you'd want to keep in print form, then you're half way there. unless of course lizards have a personal significance, tell a story etc.
having said that, i've always liked swallows in the crook of finger and thumb.