If customizing every little element of SpringBoard for looks is something you enjoy doing, then you will want to have a look at a new jailbreak tweak called Selenium by iOS developer SuperDev.

Selenium gives you a wide variety of tweaking options for individual interface elements, such as the App Switcher, notification banners, the home screen dock, the volume HUD (heads-up display), home screen application icons, home screen pages, the Status Bar, and more. ...