ShakeAnimation is a tweak that allows you to make an animation happen anytime on your device by shaking your device. It has a lot of configurable options, like allowing you to speed it up or slow it down, change the effect itself, or change the number of revolutions. Your device is also completely usable while the animation plays, meaning you can touch all buttons, etc.

This tweak is available for $1.99 from the BigBoss repo.