What should my first patron-only content be? (Patreon)

What should my first real post be about??

I wanted to make the first thing I post accessible to all patrons and I was kicking around some different ideas. I am tempted to do something related to Water Womb World (like a lore-explainer/behind the scenes look at development) just because it's gotten a new wave of enthusiasm due to the Markiplier video. BUT here are some other options.  Feel free to vote for more than one option!