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Google has been working on an Ambient Mode for #ChromeOS for quite a while
Ambient Mode is only accessible via the flag
chrome://flags/#enable-ambient-mode
When you activate it, you'll see an Ambient Mode section in settings where you can choose to enable or disable the lockscreen customization and select what to see on your screen: Images from your Photos library or Google's art gallery
A few Ambient Mode things are still unfinished on Chrome OS 85