I wouldn't use any of these, but they still look great and the colours work well together.
The contributors are a bit hard on the eyes imho but I've never been one for gold on b/w.
Ooh, these are all great as well! I actually think that I might stick with the Classic color scheme as my main theme. ATRL just looks the best in the original colors. Emerald and Grayscale are also really nice.