If the default colors are not your thing, you can create your own colors using the color mixer below the color selector. If you want to go back to the automatic selection, open the window where you select the color and in the top left, the color pallet icon will turn automatic selection back on. The default, at this time, is that the Start menu color will sync with your background. That's it, once you hit Save, this will change the color of your Start menu.

Click 'Color' near the bottom center of the open window.

Right mouse click on the desktop and click 'Personalize'.

To change the background color of your Start menu you need to change the theme of Windows 10. One of the new features that comes with Windows 10 is the ability to change the background color of the Start menu to offer a deeper level of personalization. Now that you have your fancy new Start menu back, there is a good chance that you will want to customize it to your liking. If you did not, you can go here for the direct download links for both flavors of the OS. If you are like many of the readers of Neowin, you likely downloaded the technical preview of Windows Ten.

Windows 10 change clock color