Do you sneer at people who use the default Windows desktop? If you want to set yourself apart from your grandma that uses Windows XP's Luna theme, then one of the first you do to your Operating System is make it your own. You've probably already skinned your Aero desktop and now need to customize your logon screen, assuming you haven't already set auto-login.
If you want to boot up your computer to be greeted by your favorite supermodel, pokémon, or even Edward Cullen, then this tip will let you change the logon screen's wallpaper. Read more at OCModShop.