By using this applications we can change Windows 7's default log-on wallpaper, to our personal favourite by Tweak.com's Logon Changer.
This software is easy to use, doesn't require installation, and even has built-in tools to automatically resize and recompress your images while leaving the original file untouched.
The Logon Changer also lets you quickly change your logon wallpaper back to the Windows 7 default.
STEP 1: Download downloading the app here, and then unzip the executable.
STEP 2: Run the program and it should present you with a preview of your logon screen
along with a few self-explanatory options: "Change Logon Screen" lets you browse
to a new image, "Test" will bring up your logon screen, "Revert to Default Logon Screen" reapplies Windows 7's original wallpaper.
along with a few self-explanatory options: "Change Logon Screen" lets you browse
to a new image, "Test" will bring up your logon screen, "Revert to Default Logon Screen" reapplies Windows 7's original wallpaper.
So by following these steps convert u r boring logon screen to u r favorite logon screen
For more details :http://www.techspot.com/guides/224-change-logon-screen-windows7/