I've already been over the major genres and common projects, but I'll just come out and say it: if it's already out there, do something else. Yes, there is nothing new under the sun, but don't do something just like the project I saw yesterday. We've all had the experience where we think we have a great idea, and then we see someone else release something incredibly similar before we can put thought into action. When that happens, it's time to breathe, put that project away and wait until the buzz on your clone has died down. It isn't an easy thing to do, but you also don't want to launch your awesome project just to have it overshadowed by the Gerard Butler vehicle currently playing in theatres that's just like it. Live to fight another, better day, when that hot romcom is just an old Gerard Butler project that nobody remembers and people didn't really like that much anyway.