In the pic I uploaded, the album art is used along with the artist picture could you use the embedded album art and a seperate "artist" jpeg for the background need to be able to "scrape" artists pics from somewhere.
As far as the controls go I would leave them the way they are with the song name at top and the swipe skip function you would not want to be looking for small buttons on a touchscreen.
Biggest problem with this is peoples screen resolutions differing. I personally have a 1280x800 screen but other may only have 800x600 so need some way of scaling everything to suit different resolutions. I wonder if the author of z player would give any tips on how to scrape the images.
I think if you could work out how to just display the embedded album art small and work out where on the screen it looks best, like in my photo first then perhaps work out how to make the background dynamic and have it linked to the artist name that's embedded in the mp3 tag so that the background changes to match the "now playing" artist. So for now could just manually download one image per artist and name it the same as the artist section of the tag thats embedded in the mp3 file, until some sort of automatic metadata organiser could be included. So you would have two different options "display albumart" and"use dynamic artist background"Hope I am not overcomplicating anything and believe me if I could code I would be more than happy to help. Cheers.