You can change nearly any app icon on your iPhone or iPad using the Shortcuts app, and then hide the original icons in your App Library.

Customize your iPhone home screen with themed widgets, folders, app icons, and wallpapers for holidays like Halloween or Valentine's Day. Easily move apps around the home screen, create folders for ...

If you want to get the iPad home button on your iPad screen for any reason, you can turn it on via the iPad settings. You may want to add this home button on the iPad screen if you want more options ...