Wallpaper Randomizer is a free to use utility which lets you change the current wallpaper on your desktop from taskbar system tray, it can apply any random wallpaper out of your collection of wallpapers.
Additional Tip: Desktop shortcut to change desktop wallpaper
You can set the wallpaper to change at a specific time interval as shown in the options of wallpaper randomizer in the above image, moreover you can see the next wallpaper manually by pressing Win+F5 abd Win+Shift+F5 for the previous wallpaper, related [ Free Automatic Desktop Wallpaper Changer ]
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It is very small and easy to use little utility which solves the purpose of refreshing the desktop wallpaper.
Download Wallpaper Randomizer