What’s a good curling product for your hair?

Titanicly Obsessed Asked: What’s a good curling product for your hair?

I have very slightly wavy hair. It's a few inches past my shoulder, thin, layered, and very healthy; it's my natural color and all that jazz. Because of the layers and the way my hair is, there's a very slight wave to it, but I'm looking for some more. Is there any kind of product I can use on it that would liven it up a bit? Anything you've tried that works?