One issue which iOS users always complain about is the boring icons. Ever since iPhone was released, the interface of icons on home screen is changed just once which also took Apple 7 years. Yes, iOS 7 was the first major overhaul of iOS operating system.
Chances are high that if you own iPhone or iPad, you would be familiar with Cydia. It is sort of App Store for jailbroken iDevices where you will find lot of tweaks to customize your iDevice according to your liking. Emulators like iOSEmus are not allowed in App Store, so they found their way to Cydia.