I would really love to add to this discussion, because I'm pretty old school when it comes to album covers. But at the rate technology is going, artwork for covers will be a thing of the past. We won't have albums or CD's or DVD's. It will just be an electronic file. Maybe somehow, someway art will still be associated with music, but I tend to see it fade away. Maybe that's why we are getting little response here. Most people could care less about the art... and that's truly a shame.
By the way, my favorite albums cover's usually were from artist's like Roger Dean

,
Rick Griffin

,
Storm Thorgerson

and Mouse & Kelly

to name a couple.