A good software for well-timed wallpaper changing at your desktop by your own schedule. The software builds into the Display Control Panel (look for the "Wallpaper" panel). It has a lot of comfortable settings such as:
you can add or remove from the list separate pictures as well as folders with the filtering by the file formats;
you can add new pictures from the Internet or from any TWAIN devices (e.g. scanner or digital camera);
the desktop background can be changed at Windows startup, at user's logging in or by your own schedule;
the program can work with more than 12 graphic formats (including BMP, ICO, WMF, JPEG, JPEG-2000, PNG, Photoshop PSD, Kodak PCD, PNM and Sun RAS);
it also supports high quality picture size changing, colour depth reduction, adduction drawing to monochrome (sulphur) palette and text notes (commentaries) or calendar (for month or year) at background pictures;
an additional ability is translucent making of Windows 2000/XP taskbar.