EDIT: looks like the wallpapers will only install on ICS (thanks everyone for the feedback). Sorry folks.
Galaxy4.apk is a rotating galaxy. The official name is "Black Hole"
NoiseField.apk is a bubble LWP. the bubbles respond to touch.
PhaseBeam.apk is a pretty famous LWP. needs no explanation
See the attached pics for illustrations.
P.S there may be other LWPs I don't know about. anyone with a GNex/CM9 device is welcome to request a (stock ICS) LWP here. I'll try to search for it.