AutoTools Wallpapers/Muzei

Set home and lock screen wallpapers directly from URLs, without having to download the image files beforehand.
Setting the lock screen wallpaper requires Android 7.0 or above.
Setting the Muzei wallpapers requires you to have the Muzei app installed.

Examples

Set Home and Lock Screen Wallpapers from different NASA images of the day
Set Muzei Wallpapers from Subreddit feed

Muzei

Muzei is an app that automatically changes your device's wallpaper based on various sources. AutoTools is one of those sources.
You can download the Muzei app here.