Nowadays we have Internet Explorer, Firefox, Chrome and a dozen of other internet browsers. But now there's a new one in the make! And you, as designer, have the honour to create the browser buttons! You have green light in choosing the design for the buttons, they don't have to look like what we already know from other browsers.
In fact, the more original your design is, the better! The goal is to design at least the five basic buttons ("back", "forward", "refresh", "stop" and "home"), but feel free to add more. If you like you can show them in the final browser. Good luck!