Discworld Noir had fantastic box art
, along with the US version of Broken Sword - The Shadow of the templars for Playstation:
http://e.imagehost.org/0670/brokensword.jpg.
As mentioned above, the art for Broken Sword 3 (pal edition) was really nice, and the japan edition was kinda was somewhat nice but weird:
http://i.yai.bz/assets/38/406/p1003740638.jpg