Thanks for your critics!

Indeed, the purple buttons I took from the class style. I like their simplicity (the vB 3 Buttons look way too something). I will change their color later to better fit the color scheme of the forums. I might aswell exchange them and use selfmade buttons. But since my buttons always have a crappy touch to it... Well, I dont know yet.
The different size for each forum is to emphasize the major forums. It was thought to be more eyecatchy.

HeHe I also thought it looked strange in the beginning, but now I actually like it this way!