Microsoft has released a new pack of free wallpapers with a Beach theme.
Simply titled Sandy Castles, the description of the high-quality wallpaper selection reads as follows:
What happens when you combine buckets, shovels, and a pile of sand? You get cool sand castles like the ones in these 12 images!
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.