The current themes are nice for portrait and landscape mode on smaller devices, once you get onto larger tablets they don't work out so well or rather space could be used much more efficiently.
For example, I personally hate seeing album art as I find it a complete waste of screen space. With the Classic Light theme selected on my Nexus 7, I would personally much rather have the right sidebar (search/favorites/player/settings..etc) always open OR on the left side I would add bar listing my favorites for easy selection rather than having to constantly go back to the Favorites area. As well I would expand the current playback bar to the entire width, moving the play/stop/next buttons up and add full width volume slider, very large prev/play/stop/next buttons above the volume...etc.
Actually after writing that out, I'm after a theme that is much more car user friendly. I have a customized device in my dash and the current themes don't look good or operate well in landscape.
Customer support service by UserEcho