Blah wibble urrrgh, somewhere in he deep dark recceses of my mind you have to go somewhere and click on change icon and select from whats available or if you have an icon designer program you can create your own.
Also if you use windows, there are different "themes" available I think they change some of your icons too.
For more detail, I guess you'll have to wait and see if erin, chanda or someone can help sorry.