Is there a way to change my HD icon to look like my black macbook instead of just a hard drive. I always see people with G5s and iMacs with desktop icons that look like G5s and iMacs.
Just find the icon you want on the internet, download it, select it, press COMMAND-I and then select the actual icon in the Get Info page. Now, copy this icon, select your Hard Drive, press COMMAND-I and select the Hard Drive icon and paste the new icon over the top. Voila, you've changed the icon.
As for fining the icons, MacMonkies is a pretty good place to start. Alternatively, look through one of our Desktop threads and ask specific members where they found theirs.