Logon Screen Rotator 3.2
Logon Screen Rotator is a free software that will change the logon background image to an image of your choosing and at a time of your choosing on Windows 7.
Lacey Wallpaper SlideShow 1.1
The ultimate in Desktop WallPaper SoftWare It does the same with a smaller picture in the left hand upper corner, which you can set to appear anywhere on your screen, and at any different size.