Fic brainstorming help!

So I just signed up to do the Natasha Romanoff Big Bang (15k) and I’m intending to do the Cap-Ironman one (25k) as well, but I’m not entirely sure what to write for either of them yet. So if anyone has any thoughts particularly on things you’d like *me* to tackle, let me know. Even just vague ideas of things you’d like to see my take on or themes you want to see me write.