Any web based solution needs some nice eye candy to keep it interesting. I found that icons are a wonderful way to make my intranet site look nice as well as have some functionality by allowing a visual tie in to the content. I am currently using the famfamfam silk 1.3 icon set on my intranet. This is a very nice set of icons that covers almost any possible use. Click here to visit the site.
Icons from www.famfamfam.com