I recently discovered that the tags I'd been using on my Flickr photos were not "public." It had something to do with their policies at the time I joined. So my photos weren't searchable, they didn't show up on the Swap-Bot home page (even if I used "swapbot" as one of my tags), and nothing showed up in Explore.
Now that we've cleared it up, it's fun to find out that Explore is finding me. The poster above is a collection of my photos that have shown up in Explore.