The background is probably too busy, and what I mean by that is that there's too many definite shapes and things your eye identifies and are drawn to. I'd also like the green blocks that the forum threads are made out of to be lighter, again for easier reading.
Digging the faction symbols on the main page though.
I would prefer a much lighter color for the background for the posts, so the text can be dark rather than white. I also think the grass/leaves background is a bit too... busy? too much going on. I do love the leaves behind the personal avatars though and the three casters look cool and all.