I can't figure out how to change the background color for wallpapers on WIN10!

The White Knight

Honorable
Oct 20, 2013
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I looked everywhere online and I couldn't find a thing. For example I have a wallpaper centered and the backdrop is black but I want to change it to other colors such as white. This was a piece of cake on win7.
 
Solution
Because you used it as an example of a wider query. To answer specifically, set your background to solid colour, choose your colour, then reselect picture.
I did, I just didn't specifically tell you how to do that one precise thing you asked about. I pointed you toward the customization settings. There is a way to change the background colour and a myriad of other personalization options if you can find them :)