Windows 7 only: Tiny system customising utility Logon Changer for Windows 7 swaps out the logon screen wallpaper easily. Using the utility is simple—just select a new wallpaper, test it, and you are done. The only small issue is that the image must be less than 256k and in JPG format, which means you'll need to convert most downloadable wallpaper backgrounds. If you'd rather do it the manual way without additional software, all you really need to do is a simple registry hack originally figured out by Windows expert Rafael Rivera. Tweaks.com Logon Changer for Windows 7 is a free download. To customise your login wallpaper for XP or Vista, take a look at previously mentioned LogonStudio, and then be sure and check out our guide to getting Windows 7's best features right now, or learn how to dual-boot Vista and Windows 7.