SubFire 1.5.x has been released, adding a built-in screensaver for the FireTV/Stick platform, and a little gradient color (calculated to be 'friendly' to the album cover, thanks ColorThief) to the background of the playing page.
After a year of using it, I was finding the plain black to be rather dull...
Over this week, I'll be improving the screensaver with last.fm info.