Wallpaper Engine allows you to use live wallpapers on your Windows desktop. Various types of wallpaper are supported, including 3D and 2D animations, websites, videos, and even some applications. Select an existing wallpaper or create your own and share it in Steam Workshop!
Features:

Replace boring wallpapers with moving real-time graphics, videos, applications or websites (e.g. your favorite stream).
Use interactive wallpapers that you can control with your mouse
Supports many proportions and native resolutions, including 16:9, 21:9, 16:10, 4:3
Supports multiple monitors
The wallpaper can be put on pause during the game, it's adjustable.
Create your own wallpaper with the editor
Use Workshop Steam to share your creations
Supported video formats: MP4, WebM (Workshop); mp4, WebM, AVI, M4V, MOV, WMV (local files).