Basically both, it's broke into two modules, one for category display, and the other for the main module (listings, and details).
It uses most of the DNN CSS, so you would have to add your own tags if you wanted to change it to something else. Just modify the ascx file, most of the layout is in the ascx file. The one major difference is the main display or feature page, this is driven by an XSL file which can be unique per module instance.
Right now, I posted the PA available on WWWCoder.com and SnowCovered, a source version will be out soon for about $20 more.
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