The theme in Windows 2000 and its classic counterpart in XP 64-bit used a darker shade of blue for the background, which I always tried to hand-select on the sy

The theme in Windows 2000 and its classic counterpart in XP 64-bit used a darker shade of blue for the background, which I always tried to hand-select on the systems that I had (and weren't running these versions). There was also some tiny difference between the active window colors as well, IIRC.