Hi,
In short, all category 'objects' collect their styling from the same code.
In order to achieve different looks for a ' category column' or 'category row', you would need to rewrite the VM code.
In order to successfully do that you need at least to install and learn the basic use of the following tools: Firebug and Web Developer Tools. Look on Google for these and in the Firefox addons.
Maybe an alternative is to use another template for the VM category pages? (Not sure if it can be done, since addressing of the specific VM component pages isn't easy in Joomla!.)
I'm not saying it can't be done or even that I'm 100% right, but it will for sure involve some intricate hacking.
Sorry for not being to able to help further, hope you manage.
Regards
Akerman