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SteamOS 3.9.5 has just been released for all users
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Screensaver - Big Picture Mode
Added a new screensaver feature, accessible in Settings > Customization. There are two screensavers available:
- The default is a game art slideshow that can be configured to show artwork from recently played games and your recent in-game screenshots.
- A retro inspired bouncing logo screensaver
- Big Picture mode can also load custom screensavers. Similar to startup movies, they can be placed in the config\uioverrides\screensavers directory in your Steam install directory (e.g. C:\Program Files (x86)\Steam or ~/.steam/root). You can use the bouncing logo screensaver (in the steamui\screensavers directory) as an example to get started.
https://store.steampowered.com/news/app/593110/view/710037059469839720
Also, it's not really ads when it shows you your own artwork/screenshots.