Windows 10's Threshold 2 update adds the ability for users to change the color of the title bar (File Explorer and apps windows) to their liking. This article will explain how to change your title bar from the default white to your color of choice.
Colored Title Bars in Windows 10
Click on Start > Settings > Personalization > Colors. Choose an accent color and then toggle the Show color on Start, task bar, action center, and title bar switch On: