Spotlight Desktop is described as 'This is a simple app that will take the current Spotlight Lock Screen image and set it to your desktop wallpaper' and is a Wallpapers Hub in the photos & graphics category. There are five alternatives to Spotlight Desktop for Windows, Mac and Web-based. The best Spotlight Desktop alternative is John's Background Switcher, which is free. Other great apps like Spotlight Desktop are Plash, Bing Desktop, Background Generator and Random BackGround.
John’s Background Switcher (or JBS for short) periodically changes the wallpaper on your computer (like every hour or every day) to something interesting. JBS sits in your system tray (down by the clock) and changes your background at the time interval of your choosing.
This enables you to have a highly dynamic desktop wallpaper. You could display your favorite news site, Facebook feed, or a random beautiful scenery photo. The use-cases are limitless. You could even set an animated GIF as wallpaper.
Bing Desktop delivers the beauty of the Bing homepage to your Windows desktop each day. Plus, get easy access to the Bing search box right from your desktop. Turn your searching into doing with Bing.
Background Generator is a free background maker web tool Creates large material and random background images in high resolution and high definition PNG/JPG Formats by 7 background generator programs.
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Made by the same buggers who make the buggy software that changes the lockscreen to a new image (when it feels like), so chances are it plays well with the complex windows environment. Seems like if Windows Spotlight doesn't work consistently, Bing desktop might have a setting to make the lockscreen work right. Am I reaching? Is microsoft just broken? (Probably)