iSpazio DockFlow is a iPhone mod application that available in Cydia. You could get it for free. It changes your dock icons giving them a cover flow look. Its icon looks pretty cool .However, there are a few restrictions with it. You need to have a five icon dock, the icons have to be specific icons in a specific order (Safari, SMS, Phone, Mail and iPod). You cannot use it with other mods such as Stack application. If you are willing to deal with these restrictions is does look awesome. Check out my post here on how to install iSpazio DockFlow via Cydia.