What is a good hair style for a girl with short thick hair?

I recommend a style like Rhianna's in the video for 'Umbrella'. Not only is it a great style but if you tell your hairdresser you want that style but you want it too look thick then she can layer it for you if you tell her you want it to be thinner she can cut it to appear thinner.

Or you could straighten it. A pixie bob would look sorta cool as well. And to make your hair seem thinner you could get layers.