Over a survey that a website company took, left hand navigation seems to be easiest one to follow most sites use buttons but make them easy to read.
Here are a few sites that provide graphical buttons that you would merely save, insert into your web pages.
http://www.aaa-buttons.com/html/1-8.shtml
http://www.newcybertech.com/buttons_new.html
And here's a very useful article on modding someone's buttons so for example putting a 'roll on' which simply changes the images once you put your mouse over it to make it look even more appealing.
http://www.thesitewizard.com/wizards...-buttons.shtml