We've seen her weaves transformed drastically during the last few years. Most of them were really immitated by most girls all over the world.
First the bob cut, which is undeniably one of her most iconic style and people all over the world went on to copy the style. Then she went the short hair ala TAB. Then the Red hair. The shaved side (yes Cassie maybe the first to have it) but Rihanna popularized that style. Not to mention the RR era hairstyles.