How to change the forum background ? ;3

[katie hunter]

Hey!! I am trying to play around to change my forum background but I don't know how to
Example : like this one, that anime girl on the background of the forum, how can i do something like that ?

http://www.sectahentai.org/foro/index.php?

[Triky]

[How to] Create your own vBulletin style (http://www.vbulletin.com/forum/showthread.php?t=220805), you will find your answer here. ;)