How about changing the wallpaper on your iPhone. I love this picture of my granddaughter and the little mermaid versus one of Apple standard wallpapers. It’s simple to do, here’s how.
Go to the settings app And select the wallpaper menu item. Choose change wallpaper and then select the photo that you would like to use. You can use the same photo for the lock screen and for your background screens, or set a different photo for each one.