Replacicon - Customize Your Mac
Mac users are notorious for being sticklers for aesthetics. Luckily, customizing the appearance of your device is made easier by various third-party utilities. One of those is Replacicon, an outstanding app that maintains a constantly updating catalog of alternate icons for your installed applications.
The Replacicon interface shows an alphabetic list of your installed apps that you can filter in different ways, showing only the apps in your dock or by permanently hiding apps you don't want to see listed. It shows you each app's current and legacy icons, allowing you to hide the current icon if you choose. If you have apps installed outside the default locations, you can add those folders to the ones Replacicon searches.
If you have your own icons for apps, you can import those into Replacicon. You can also use Apple Intelligence to generate new icons if your machine has that capability. The app runs on Intel and Apple Silicon, and on macOS 13 and higher. Your alternate icon selections are maintained across app and OS updates automatically.
Replacicon is a $5.99 one-time purchase from the developer's website.