Did you have a similar brainstorm after the theme anouncement?
My brainstorm culminated in the idea to make a game about... Brainstorming!
I think the game is actually uite fun once you understand it a bit and it may even be a brainstorming tool :D
If you want, you can to try it at https://ldjam.com/events/ludum-dare/46/brainstorm
https://shakedimus.itch.io/brainstorm