Used since Windows Phone 8.1. Background color or pattern is user chosen.
Used for Windows 10 Mobile and was removed in the anniversary update.
Microsoft Windows apps
3D Builder | Alarms | Battery Saver | Calculator | Calendar | Camera | Clock | Console | Data Sense | File Explorer | Fresh Paint | Games | Groove Music | Mail | Maps | Messages | Movies and TV | Music | Notepad | Paint (3D) | Phone | Photos | Podcasts | Settings | Storage Sense | Video | Wallet | WordPad