How to create an "if found" wallpaper for Android?

This is where I saw the terminology "if found wallpaper" . > **Make an "If Found" Wallpaper** > > However, if you do use a password or pin and lock your phone by default, be sure to update your wallpaper to include contact info. Basically, since we're all locking our phones, you want a wallpaper that contains contact information, in case it's lost. Is there such a wallpaper for Android?