If you are bored with the look of your Google Chrome theme, you can always install a new Google Chrome theme, however if you want to add some interesting icons to Chrome without installing a theme, you can do that with the Toons Buttons Google Chrome Extension.
The extension just changes the default icons that are used by Google Chrome, however you can only install extensions on dev build of Google Chrome, if you are not using it yet, you can read the following articles to get started.
