Bohemian Rhapsody effect AE/FCP?

Hi
Does anyone know how to do the Bohemian Rhapsody psychadellic effect, I believe it to be otherwise known as 'Infinite Mirror' effect in either After Effects, or in FCP with people keyed out in greenscreen?

I've done some searching but found little to no results!

Thanks all.. looking to recreate these sorts of videos:

http://www.youtube.com/watch?v=Wzv_4E_4OIs (Around 50 seconds in)
http://www.youtube.com/watch?v=irp8CNj9qBI (you know the bit I'm talkin' about!)

evil_santa said:

both those effects were made by the output of the camera being fed in to the screen behind the subject.

Click to expand...

Yeah, but I don't have any large screens so I was wondering if we could replicate it if a person was chromakeyed out - thereby having a transparent background by which you would effectively place a filter so replicate the same effect.