That is not a framebuffer effect. This is vertex deformation with vertex shader. Easily doable. But guys you do realize even though all those effects are doable i dont have the time to implement every single one in 1 day right.
Dont bother with it unless a concrete mod team actually asks you to do something. If you continue working like this, you'll create tons of effects that are
maybe going to get used by someone when he/she/it notices they even exist.
Seriously. Yeah, oohs and aaahs from the general populace are always oh so very rewarding, but on the overall, if it isnt going to get used in a concrete manner, you've wasted your time and effort.