Windows 10 is bringing a few options to customize the way things look. In fact, we wrote up a massive tome of all the various options you have at your disposal:
One of the more hidden abilities is to set a custom accent color. Microsoft lets you choose from a palette of 49 hues, which is probably fine for most users. In fact, you can let Windows auto-match the color according to your wallpaper.
However, you can go further and pick an exact color, including saturation, hue, intensity, and brightness. This feature is actually hidden, but with a simple run command you can have access to it. Let's see how.
Custom accent color picker
Use Win + R to bring up the run command window, or type Run into Cortana/search box on the taskbar
Type in (or copy and paste) Control Color and hit OK
Reveal the extended menu by clicking on Show color mixer
Using the various sliders, you can pick the color, hue, brightness , and intensity to your liking. Hit Save Changes once you are done.
If you are using the release version of Windows 10 build 10240, the color changes the Start menu, Action Center, and Taskbar. If you are on the Insider build of 10525 or later, the color you also choose changes the Title bar on apps.
Of course, nothing is permanent. If you would like to undo the change, just go into All Settings > Personalization > Colors. From this area, you can let Windows auto-select an accent color based on your background again or use one of the 49 presets.
Most people should be okay with the default options in Windows 10, but for those who have a real peculiar hue that they want, this trick should help you out!