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Navigate to: HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Themes\Personalize folder, and double-click “Color Prevalence”, then change the Value Data field to “1”.Then, type “regedit” in the “Open” box and click “OK”.
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Type “regedit” in the search box of the taskbar and click “Registry Editor” or select “Start” > ”Run”. To set a background image, simply right-click on any image from your files and select “Set as a background”. Below is a guide on how to make Windows 10 select the accent color automatically to complement the background. Personalizing Windows 10 without activation is slightly more complicated, but possible through the Registry Editor. How to Change the Windows 10 Taskbar Color Without Activation
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