Feature Request: A visualisation API for Google Play Music being played to a Chromecast.

This idea started with the GPM labs Fireplace which displays a fireplace while casting music. I wanted instead the Chromecast Backdrop with a text display in the corner of currently playing track and track position. But then I thought it would be cool to have a more general visualisation API like those in Winamp or Windows Media Player.

Because this would be tied to GPM, I'm guessing it would have to be a GPM lab project and would have to come from Google.

First would this be do-able or is there some obvious gotcha why it would be impossible? And 2nd where should the suggestion be fed back to Google?