initial individual & group ideas

In my group we decide to do a Thriller and so  i am going to make the title sequence be a sub-genre and add some fantasy or drama aspect  to it to make it more interesting and unique.I came up with three ideas which i will develop later on and hopefully make it the title sequence we choose at the end.Idea number 1 is that the film will be about someone in the CIA whose family was killed in an mysterious 'accident' which was found out later be on purpose and we see in the title sequence them trying to figure out who and why the killer did it.My secound idea is that Two sisters get arrested for a crime they didn't commit and have to look back at thier memories to figure out who framed them and in the title sequence we see them in a room and on a board we see pictures of suspects and the two sisters solving the case. My final idea is that someone was almost killed and ended up in a coma and someone has to look in their mind to see who and in the title sequence we see a look into there  mind  and them at the end opening up their eyes.