Jepit is a tweak that allows you to change the animations when switching apps using the app switcher. There are a lot of animations to choose from, and even other effects, like changing the speed of the animation. It's not compatible with some animation tweaks out there, and it's not the most optimized, but it's still cool enough to check out.

I did not make this video, nor am i responsible for the contents of it.

You can get this tweak for $1.59 from the ModMyi repo, or maybe free, if you get lucky. Apparently the repo's messing up.