Here is how to enable the Dark Theme for Windows 10 build 10074

[Windows Central]

Microsoft is adding more polish to Windows 10 Technical Preview, including dark Start menus and more in the latest 10074 build for Insider.

Now, a new ? and simple ? registry trick lets you make even more of the OS dark. Specifically, the Settings, which is still a bright white that contrasts profoundly with the otherwise dark main screen.

Full story from the WindowsCentral blog...