This is more of a decorative feature than a practical one but I think it would be nice to have a last played album art file much like the next playing album art that already exists. This way, we could have something like the image below, which is a nice touch to have in the studio. On a side note, it would be nice if the next playing track information was a separate file rather than it being included in the now playing metadata. Maybe a last played track information file would be nice too!
Something like this:
Something like this: