The lizard carries a lot of symbolism, and cultural effects. You should take a look of these designs below, to find the best for your personality, I tried to choose really different designs (simple, colorfull, sketchy etc).
A colorful realistic lizard tattoo
Lizard of The Luck Tattoo
Not a really colorfull, but realistic
As lizards have many breeds, try to look over all, read about lizards, and lizard's life style.
Don't forget lizards not same as geckos (amateur tattooists often forget this fact)
Fantasy styled lizard tattoo design
My opinion is, lizards tattoos fit perfectly at your back, and your upper arm, forget your leg or any other body part.