Windows 7 Logon Wallpaper

My computer at work shows the logon screen a lot of the time - I spend too much time away from my desk. Rather than the default Windows 7 screen, I like it to show something personalized. Today I came across this tool, which makes changing the background a lot easier than the manual process I'd been using before: http://www.julien-manici.com/windows_7_logon_background_changer/