Hi,
Thank you for posting your query on Microsoft Community. Let me assist you.
You can change desktop background, desktop themes as well as tile colors on Windows 10, according to your preference. Check if the below steps help you.
Steps:-
1. Go to your desktop, right-click your mouse and go to
Personalize.
2. On the left pane, go to
Themes for background themes. You can even download new themes by clicking on, “Get more themes online.”
3. Click on
Theme settings for personalizing your theme.
4. On the left pane, select
Colors to change the color of the tiles.
5. You can change it according to your preference.
Hope this information is helpful. Please do let us know if you need further assistance, we’ll be glad to assist you.