A XWidget theme called "Silhouette Land" that includes the "Silhouette Land FULL SCREEN" and "Birds in the sky (mod)" widgets.
You can download the "Birds in the sky" widget from here:
https://jimking.deviantart.com/art/Birds-In-The-Sky-for-xwidget-456158620

11 scenes in silhouette style as a full screen widget.
* Empty (default field)
* Tree 1
* Tree 2
* Windmill
* Farm
* Horses
* Cabin
* Mountains
* High Mountains
* Wind Turbins
* Father Kid

Right click to change the scene.

YOU CAN CHECK ALL THE VISUALS/SCENES from here:
https://imgur.com/a/onRJd

NOTE:
I tried to create smooth animations but the CPU usage was a bit too high.

---FITS ON 1366x768 SCREEN RESOLUTION---