The 1.0 version of DesktopPictureTimer for Mac was provided as a free download on our website. The actual developer of this free Mac application is Marco Weitz. The software belongs to Theming Tools.
From the developer:
DesktopPictureTimer changes the background of your desktop at a defined time to a defined picture.The auto change of OS X must be turned off in the prefs.
You may want to check out more software for Mac, such as Art to Desktop, which might be related to DesktopPictureTimer.