From Accidental Software:
This program makes it easy to use your pictures as Windows Wallpaper. Simply collect the pictures you want to use from any drive or folder on your computer. Add these pictures to any of 10 lists (each list can contain up to 1000 pictures). Set the interval you want the pictures to show as your Wallpaper. Each picture can have its own display method (tiled or centered). This program places an icon in the Windows tray. Left click the icon to bring up the mini manager that allows you to change wallpaper lists, step through pictures, goto any picture in the list, pause the recyler, and much more.