Twentyten menu style edit for individual sites

Hello,

I have an up to date multisite install, using domain mapping, blog template and multi-domain plugin.

I have created a template using twentyten and have a network of recruiters. I would like to be able to change the navigation colour or style for each site just as I change the background. So recruiter A will have navigation colour green and recruiter b will have nav colour pink.

Cannot find a way to do this. I have looked for the editor link in the appearance tab but cannot find one.

Is this possible?

Thanks again

TB