I am sure that everyone who uses Windows 7 would take interest in this interesting tool that I found. It lets you customize the login screen background.
It has an extremely easy-to-use GUI (Graphical User Interface, for those who don't know). It uses any 256kb or less image, and stretches it to fit your screen. You can either pre select an image of that size, or you can let TweaksLogon adjust the image. This makes a copy of it for it to set as the background, and it also backs up every image used as a background.
Another good feature let's you preview the login screen after you set the image.