See that navigation menu above the fierce one? Isn't it great? Actually, it's quite simple. If you like it, continue reading about how to implement it:
First, back up your template (this is essential in case you regret later). Download the Cssmenus style package, which contains 11 beautiful CSS menu styles. You can choose whichever one you like. Upload the two background images inside the package to yo2 and make a note of their URLs.
Then, add the CSS menu style code to the stylesheet in your template's theme editor.