After seeing the Google Music application from the Nexus Prime, Ice Cream Sandwich ROM leaked, above you can see a still from what alot of sites are saying is the boot animation from the Nexus Prime. Over at Droidworld forums they`ve provided the Boot animation to install on your rooted phone via Clockwork recovery.Hit the break for file link and instructions on how to install it.

Animated Gif of the boot animation :

As per usual when doing anything like this, only do it if you know what you`re doing.

You can download the file here