In Windows 2000 and XP, the default solid color Desktop background was a serene shade of blue:
The "Windows Classic" theme in Windows 7 used the same color, but there was a slightly darker blue default color available in the Solid Colors menu, which was still available in Windows 8.1:
Inexplicably, Windows 10 not only removed these calming blue tones and replaced them with 24 largely garish colors,
but also failed to provide any option for customizing colors in the main Settings menu (right click Desktop > Personalize > Background: Solid Color). Happily, the classic Desktop Background applet is accessible via Run > control /name Microsoft.Personalization /page pageWallpaper. Not only can you select the Windows 7 darker blue, but you can also create custom colors by clicking "More...".
UPDATE: The day after this post, Microsoft released Windows 10 Fall Creators Update, which includes a "Custom color" option in the main Background settings window. Click "More" to enter RGB, HSV, or hex values.
/windows | Oct 16, 2017
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