well, we could build a site or blog with keyword optimized articles and content for
seo purposes, and compile the public domain works into a product to offer for sale on the site. that would add to the value of the site. or better yet, compile the pd works into a free ebook as an ethical bribe to get mailing list opt-ins.
take a look at
http://jamesallencollection.com again, that's the method i'm working on with that site. it was created in one day for next to nothing in expenses... domain and hosting.
so... content + product. we could duplicate that process with virtually any niche. zen, spirituality, health, whatever.