I thought I read years ago that there was a 7th color, Gray, but since that time I haven't heard anything more about that. I was told that the original MGM in Detroit used the same colors, they did have Gray in their set. I also think I remember seeing a 7th color in TCR years ago, but now only 6 colors are listed. I just figured that meant a 7th color was never confirmed for the MGM Vegas.