If you're not sure what I mean, here's what prompted it: On a fic based on a video game I was enjoying, the author mentioned they were having some writer's block and asked for ideas. I suggested something roughly based around some real-life fan controversy with the studio getting bought out and the author turned that into a really cool twist that everyone in the comments enjoyed. I even got a thank-you in the endnotes for that suggestion! (I won't go into more details because of Rule 3)

It doesn't have to just be about block-breaking suggestions, it can be roleplay/omakes in the comments, fanart or readers that become betas for the author. You can answer either as the reader or author.