Want to Change Logoff Background Screen

I have been searching with no solution in changing the background in the logoff of W 7 during the process of "saving my settings" and "shutting down";I did it but no recollection how I did it about 2 months ago. I did not do a registry hack and certain that it was through the Personalization in Control Panel. I'm only assuming this as while I was adding desktop wall paper a couple of days ago in "change the visuals and sounds of you computer" I clicked on either a picture in My Themes or Aero Themes that changed both the desktop wallpaper and logoff screen to a Windows 7 standard theme. The logoff wallpaper can not be found but the desktop wallpaper stayed in My Themes.
I have found some simple programs that whatever new logon wallpaper is added,it will be the same wallpaper for the logoff background.

Thanks

Appreciate the fast responses but neither will seem to work. Both are Logon and not by itself a "logoff" wallpaper changer. I believe that both small programs in what is selected for a logon wallpaper will be the same for the logoff. If one of these does wallpaper independent from the other, I apologize and would appreciate the step that I'm overlooking in the program.