Extremely busy, even for me. Scrolling text, empty forums and far to many flashing images which distracts from the style.
I would also work on the alt1 and alt2 gradients and give them a more subtle feel. One of the gradients really does give off far to much prominance compared to the other gradient in the alt areas.
With regards to the images above the tcats. I would implement some kind of string so they look attached to each other or design some kind of branch so they don't look like they are defying the law of gravity.
I couldn't review any further than the forumhome because every forum is set to private but judging by the forumhome I would tone down the flashing and scrolling images and concentrate on simplifying it a little.
Keep the style simple using subtle colours and allow the images which you design to break out the style to give it that xmas edge.

Xmas edge, I like that one. :up: