These are installed by using a file manager aka "Root Explorer" and are not flashed. Rename to "bootanimation.zip"
The sparking orb.
Rotating Xray skull
Clouds to sunrise
FU & kiss my butt (personal favorite, but large file size)
Golden purple swirl
My envisioned of nexus (updated 11/12/13)
I also take general requests which requires two people asking for it at least.