Ideas for teaser trailer

Over the past two media lessons, Tom, Emily and I have looked into some ideas that we could use for our teaser trailer. At first we came up with the genre we wanted, which was a horror. We like the idea of a diary based fim as this mean the audience could see the stroyline through the character's eyes and see into their thoughts and feelings. Our first ideas for our teaser trailer were too much like a trailer, as we were using images from the film more than a teaser trailer would. The idea was about a young girl writing her diary, with a falsh to the days events, with her shadw in a shower, then a flash back to her, andthen back to the bathroom with a steamed mirror with a message on it.
We changed ou idea but kept the use of a diary. Although the title of our film is unknown at the moment, we are keen on having the film based on a stalker of some form, human or not is unknown at the present. Our idea that we are working at the moment is using no footage from the film, a young girl writing her diary, a transition to 'Paramount' etc, then to a view through someone\thing's eyes at a house, we then will see a note floating tothe floor with something like 'Im Coming' in news paper cutting. We then will have the screen to change to title of the film and then the year date.
This is only a working progress of an idea though, and will be subject to some change.