The Xbox One November update introduces the ability to use achievement art you unlocked as a custom background, in addition to a rather extensive palette of colors.
If you want to see how they’ll look on your Xbox One, below there are a few pictures I snapped from the screen of my own, on which I downloaded the update beta. You can also see the option to set your background directly from the achievement app and the palette of available colors in the settings menu.
They definitely look quite spiffy, don’t they?
Microsoft promised further customization options in the future. We’ll have to wait and see what they’ll be about. I know my first request will be the ability to select the degree of dimming of the background art.