I don't want to say it's the worst color scheme possible, because it might be possible to come up with something even uglier, at least in theory. But blue text on a light blue background with pastel orange highlights is really horrible looking. See the Apple Dev forum for a really nice color scheme with XenForo. I'm just being honest. The visual design is the best I have ever seen of any forum, but the default colors probably turn off a lot of people.