I have changed the forum's default style to XenForo style - Leafy Greens, because it makes us look different at first glance from the usual default blue that more forum styles come in.
But don't panic if you like blue! Just go to your profile, click on "Preferences", and the very top option will let you select which style to view the forum with. XenForo style - Original was the old default.
We also have another blue, a slightly different shade from the standard forum blue. It's called XenForo style - Blueberry, and I think it is a nicer blue than that used in the default.