If you wish to change the look of your iPhone, this guide shows how to customize iPhone icons to get the look you want.

Step 9: Tap on the icon next to your renamed app on the next screen to change the image. A popup will appear that will ask you to choose between taking a photo, choosing an existing photo ...

Plenty of third-party launchers make it possible to change icon sizes, grid layouts, and more. We recommend a few launchers for those who want more control over their icons (and UI, overall).