For example PIL's Metal Box in the cylinder can or Spiritualized's Ladies and Gentlemen... with the tablet packet (personal favourite that).

On that note I used to always buy the Spiritualized albums with the special packaging then get home and realise they didn't fit into my cd racks.

In terms of artwork I've always liked something that reflects the music and the cover artwork of the 1st Godspeed album F#A# (Infinity) is one I like.