Wallpaper Clocks and Desktopia are great freeware programs that set time-specific wallpapers to your desktop, providing you with a fun and effective way to keep an eye on the time with attractive wallpapers. Wallpaper Clocks uses a refresh function to refresh your wallpaper every minute to display the current time and date. Desktopia changes your desktop wallpaper at user-defined periods. (though you could set completely different wallpapers to remind you to change work modes or tasks). Wallpaper Clocks and Desktopia are more great freeware, Mac OS X only.

Get Desktopia HERE.

Get Wallpaper Clocks HERE.