Most people like to make their computers fit with who they are, they want to personalize to make it more enjoyable to work on them.
Windows 7 allows you to do more then XP ever did…. Theme packs are for sure one way to really make your computer yours…
I have found several sources that go through the process….
Windows 7 Tip of the Week: Personalize Your Desktop with Wallpaper and Aero Themes – Supersite for Windows
Take a look, all of these are good to get you started making your computer special.