I think, only genka has the possibility to add another style to this site.
Well, that is possible, but may not change the things in a way a few users want to have it.
It's possible to change style with WSC3, but that means rather colors, logos and stuff, but size just within a rather small boundery. Outside of that, Forum will look ugly and unusable. So, we will never get back the arrangement of a BurningBoard 2.x ... WSC3 has it's base design, we need to accept.
The header space with the logo did not change compared to the former version ... main menu is a few pixel higher than before. But I think the main problem is, the arrangement of the boxes. That could be maybe changeable ...
Regards
fnu