Whenever you listen to a song, iOS puts a widget on your handset’s Lock screen so that you can see what’s playing and interact with the playback as you see fit. As useful as this is, it’s particularly unfortunate that Apple doesn’t let you customize the widget’s aesthetics in any way.
Thankfully, it doesn’t have to be that way if you’re jailbroken. A newly released and free jailbreak tweak dubbed CustomPlayer by iOS developer iCraze enables users to colorize the Now Playing widget however they like.