The green definitely stands out and I would have to say that a green colour should be used for any important announcements this forum has, if that is possible in the site's coding. I would count important as anything reagarding competitions, new features, changes and new partnerships.
May I see the green more like the Francesco's wing green and see if that looks any better than the Mike green?
Also I would personally like to see the blue more like Sulley's blue from the site picture at the top. It would look less grey and may stand out more on the page.
Feel free to disagree with me people. This forum is as much yours as it is mine and input from more people will get the foums looking how you want them to.