After a very short while, I get bored of things I frequently see. The logon screen, for example, is something I see several times a day. I quickly got bored of the default wallpaper Vista provides for your logon screen, so I decided to personalise it a little.
I used a program called LogonStudio by Stardock. It’s a free program, and basically it just changes the wallpaper of the logon screen, to whatever you specify.