Gemblock has finally followed up on their original Black Diamond Theme for the 8100 by releasing the theme for more devices. The new update brings the Black Diamond theme to the 8100, 8300 & 8800/8830 devices. The theme has the same subdued look of the original Black Diamond and looks pretty slick. The whole theme is black and white which I know many people like. Personally I like color since it helps my eye differentiate between icons. The only fault I can see with such a theme is that 3rd part icons will look very out of place compared to the themed ones.
Update: Black Diamond Zen Theme can be downloaded via this link at GemBlock.