I am fascinated by interactive objects, especially if there is an element of chance involved (drawing machines & frost catchers).
So I thought this was pretty elegantly cool when I saw it (posted on the elegantly cool website today and tomorrow.)
Ink bleeds into the cover when you open the CD package (you could probably manipulate it as well, much like the old Polaroid prints).

A comment on that page points to this, the ultimate in interactive covers.
Being a painter, the first one is the most intriguing to me. But then, who wouldn’t find that circuit board piece cool?
otomo yoshihide
korekyojinn
haino, kawabata & yoshida