Hey @Jurisdiction! 
Each week, @staticshocks picks a character to highlight for the weekly “Set The Mood” activity, in which you’ll create a mood board for that character! A mood board is basically a collection of images that relate to a topic - kind of like a collage. It’s fairly free-form, so you could post pictures, fanart, gifs, etc.
Here are some other threads with further examples: [1] [2] [3]