I need your opinion, ladies! Fashionable eye glasses.... HELP!?

I wear contacts most of the time, but still wear glasses 2 or 3 days out of the week. I think they can be super cute, but sometimes I find something very fashionable looking and try it on and it just doesn't look quite right. So, I need your help! I have a rectangular face shape (think Jennifer Aniston), light brown hair (side bangs, and my hair is three or four inches past my shoulders with layers), I have fair to light skin (neutral undertones), and green eyes. So, what color of glasses would be best? Brown, black, what? Thick frames or thin frames? What shape? Links to pictures or something would be great! Thank you so much!