I love getting quirky badges for completing some of the side quests. I see it as a reward for doing the sides and not just rushing through storyline. For example, "Assistant to the Master Artist" for the Piece de Resistance! quest.
I was sad when I ran the Ghost Maze in Mirage and didn't get a fun badge. Then again tonight, I just ran the House Oddity instance and was sad when no badge at the end. It seems that the pop culture references in those sides would be a perfect setup for a new, fun badge.