Brainstorming is too unstructured and unpredictable, a form of "creative disorder" that has received more credit than it deserves.
What about discussing ideas that you think have a decent shot at being good and important, but that you can't explain fully and still aren't that confident in?
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one.
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.