Microsoft has released a new pack of free wallpapers with a National Parks nature theme.
Titled The Grand Canyon National Park pack, the description of the high-quality wallpaper selection reads as follows:
Take in the sunrise on the North Rim, sunset on the South Rim, Hopi Point at dusk, and Horseshoe Bend under the stars in this 16-image set, free for Windows 10 Themes.
After downloading the collection, go to Start > Settings > Personalization > Themes and click on the theme you prefer.
To apply and change to the most appropriate colour, based on the current wallpaper, go to Customize > Colors > Automatically select a primary colour from the background.
Find the collection in the Microsoft Store here.