1)   WALLPAPER MANAGER 3.6
Just set the time of changing the wallpaper. It will automatically change the wallpaper at the fixed time. It also has the option to change the wallpaper at windows startup. There are many other options. just try it out!

 2)   Uranium Desktop 1.1
Uranium Desktop lets you automatically rotate your wallpapers in 2 easy steps: First you specify one or more folders where your wallpapers are located. Second, you set the time interval, ranging from every few minutes to every month.

 3)   Adolix Wallpaper Changer 2.2
Adolix Wallpaper Changer is a free wallpaper changer and randomizer that will allow you to change background on your desktop. You can make a play list with your favorite pictures and play it all day long.

 4)   WallpaperWarp 1.00
WallpaperWarp 1.0 is a desktop wallpaper changer for Windows based operating systems. WW allows you to select a folder of images that you would like to be displayed as wallpaper and schedule them to change at predefined intervals.

 5)   Chaper 2.3.1
Chaper is a modern wallpaper manager for Windows 2000/XP. The program supports JPG and BMP file formats and can switch wallpapers at specified time intervals, either in order or randomly.

 6)   TyphoonWallpaper 1.0
Choose any picture as your desktop wallpaper. Provides access to our huge library of free super hi-res wallpaper images. Features include auto-cycling of wallpaper images, wallpaper special effects, and support for multiple monitors.