From the minimalist Store entry:
You love the daily locksreen rotation of Windows Spotlight, but desperately can't find a good way to download those beautiful pictures permanently? Well, then this is an app just for you!
Here's SpotBright in action:
First step is to 'Search for pictures' - this grabs all the available Spotlight images from Microsoft's servers - 246 at the time of writing (though you actually get twice this in terms of downloads - see below)
The downloaded images appear in your Photos app in a 'SpotBright' folder, for easy reference. Note again the apparent duplicates, I'm coming to that below! (right) in the Settings are functions to auto-scan in the background and notify you when new photos are available, but also (as a 'pro' feature) to auto-change your lockscreen and wallpaper much more often than daily. Keep it fresh!
The reason for the apparent duplicates is that each image is grabbed in both original and vertically-cropped form (the latter being set for portrait smartphone Start screens). In other words, the best of both worlds - the former is used for the auto-swapping of wallpaper, the latter for you to enjoy looking at in landscape and perhaps use somewhere else, in a private document or photo frame or whatever.
You can grab SpotBright for free here, though note that the auto-setting of wallpaper or lockscreen requires the in-app-purchase ($1) to the 'pro' version.