If you search for 'Wordpress themes' theres a site that sticks out like a sore thumb which piqued my interest - themecircle.net.
Looking at ahrefs they appear to be ranking from Google Maps links, that you can't actually see. I thought at first they might be customers who haven't removed the code, but a lot of these sites aren't Wordpress ones...!
A Russian guy asked about this last year: https://translate.google.co.uk/translate?hl=en&sl=ru&u=http://searchengines.guru/showthread.php?t=937305&prev=search
Does anyone know anything more, perchance?