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We've done something similar (changing the logo and navigation bar for different categories within a module), using the ID for each category to determine the appropriate display.
There's a
test site up that does this for the news, links and downloads modules. If this looks like it might be useful to you let me know and we'll provide more info next week.
It works pretty well so long as you don't need to add new categories all the time - since you do have to go in and add the IDs for each new category that you create. I think WF-Section uses article IDs, not category IDs, so it might not be very convenient with that particular module if you are using it to publish a lot.