Speaking of things that Kellan has done recently, Jayel over in this thread: Flickr Trends Search kicked off a whole Flickr Central thread of This vs That …
… including Girls vs Boys, Mayonnaise vs. Ketchup, Winter vs Summer and Varying vs Flatlined.
Why not go and have a play?
As the footer says “derived from the awesome NYT Trender and code by derekg
adapted for Flickr API by kellan”