Why not do what our affiliate
itchy did ?
http://sincitytv.com/
He made the site in about 2 seconds flat... you could do this using both our gallery and blog entry rss feeds.. You can choose feeds with different niches so each site has completely different content on them and then cross link them, etc.
They will automatically update every time we add a new entry for the niche(s) you have selected. We have a parser script that is as easy as copying/pasting into your page that's available form the affiliate area