In Sep 2020 Apple announced that in iOS 14 users can change apps icons.
It was not possible for the entire iOS history, but now all users can customize their icons on the iPhone and iPad.
This big update allowed designers from around the world to create their custom icon packs for iOS.
iOS Icons it the first marketplace for custom iOS icon packs for your iPhone.
If you a designer you can submit your icon pack. Just go to Add Icon Pack and fill-up the form.