Motion is a tweak available for iOS 4 and above which allows a range of effects to be applied to your iPad icons. This tweak is does not add a new icon and can be configured in your Settings extensions. Having too many of these enabled can create a pretty complicated looking springboard, I prefer to have only a couple different motions enabled.
Motion setting options are available:
Vertical Wave: On/Off
Horizontal Wave: On/Off
Motion from Cydia runs for $1 and is a nice customization for your springboard. Be sure to check out other iPad Cydia Tweaks review here at iPadJailbreak.com