How do I exclude album art from the gallery? The answer to this question is not valid, because embedding the album art inside the media files does not always work, as I outlined in this question.

So basically, I want the hundreds of album art images to stop showing up in my gallery. I can't use .nomedia because that would invalidate any music in the same directory. Are there any other options?
rename the album cover to "folder.jpg", and it will be skipped. You can save the rest of the album art in a nested folder with ".nomedia" inside it.