Annual Theme Pins

For my second trip to DW with my kids and nephews I thought we'd try pin trading. Of course I am overthinking this, like I do everything, but then when I am thinking about Disney it is part of the fun. I am trying to focus my pin collecting to themes meaningful to me. I regret that I did not get a pin with last year's theme. Can anyone verify that last year was the Happiest Celebration on Earth? Does anyone know where I could get this pin? I see one on ebay that I may bid on. It is hard for me to narrow down my pin collecting, they all start becoming cute and meaningful to me! Should I collect a pin for each ride? Expensive! A pin for each resort? A pin for each theme? My favorite characters? What do you all do?