On the main page of the forums :-
http://www.horror.com/forum/
Log in, and scroll down right to the bottom.
Under the Current Active Users, Statistics, and times in GMT and current time, look to the left for a small Choice Box with a Drop-down menu.
You have a choice of styles - Ambience (current default light grey), and horror (main page color/style scheme)
Select "horror".
Voila!
And if you dont like the new "horror" style and want the old "Ambience" look back,
go to your USER/CP and click on "Edit Options".
From there, scroll right down to the Miscellaneous Options section.
Choose "Ambience", and click on "Save Changes". You have the old look back again.
The choice is yours, HDC. Enjoy.