XF 1.2 Different Background for each Category


Hey guys,

I am looking for a way to make each forum of my site have a different background. I'm not talking about different BGs on the main page like this:

What I mean is this:

I have 6 different categories on my site, and I want to have each category having a different background, e.g. all forums of categorie 1 have this BG

all forums of categorie 2 have this BG:

and so on. I hope you understand what I mean^^

Is there a way to make this happen? I set the current BG with the HTML and BODY style properties in the ACP, but they can't provide different BGs for different categories, can they?

Thanks a lot!