Wallperizer is a portable and Open Source desktop wallpaper changer that can automatically change wallpapers based on the user’s settings. Multiple folders that contain wallpaper images can be defined during setup. The program will automatically pick wallpapers from all folders and set them as the desktop wallpaper.
The interval can be changed to display a new wallpaper after specified time has passed or when a certain time of the day is reached. Wallperizer can resize wallpapers automatically based on an if else statement that might confuse users who do not code.
There is also a tab for basic effects that include normalizing the brightness and setting a gamma level of wallpapers.

More interesting than the previously mentioned options that are more or less integrated in most wallpaper changers are the following features. Wallperizer can display a calendar on the wallpaper. The calendar can be defined in detail including its position and detail level.
This calendar might be interesting for users who would like to see these information on their desktop without having to use a desktop widget or software that is displaying it.
The calendar cannot display customized date or synchronize date with other applications. Users who are interested in downloading the application can do so at the developer’s website.
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Interesting looking program, sadly no support for dual monitors
No link
http://www.gardenerofthoughts.org/ideas/wallperizer/
Good Program! Is there something similar for screensavers?
Though it would be useful so installed it, not what I wanted, so I tried to deinstall it. Problem – it kept reappearing on reboot, I had full Admin privilages and I still could not delete files & directories. Eventually had to use Safe Mode to remove files & dirs, then cleaned out the registry – most free file killers couldn’t touch this! If you like it OK, but be aware removal is a pain.