I have seen various posts asking for a screen saver to be able to run while Pandora is running rather than just the static Pandora screen. What would be better would be some form of a Music Visualization feature. ProjectM is one such package and its libraries are Open Source on Github.
Please consider integrating ProjectM or a similar music visualization package (light show) with Pandora.
Note that ProjectM is available as an app for purchase for Firestick but there are issues trying to run it with Pandora. On some models of Firestick, Pandora will stop when you press the Home button to go and launch ProjectM. Another problem is that if you simply run ProjectM on Firestick as you receive it, it will make pretty screens but will not actually respond to the music like it is supposed to. I dug into it and found a command that you have to send to your Firestick using ADB from a PC that enables ProjectM to access the Pandora audio stream. This is not something that the average Pandora user would be able to do. It would be much better if you guys integrated it into Pandora so it would work without having to change settings or send ADB commands.