ideas?

I did my 2nd shoot with the projector at my abandoned house and I am still struggling with editing the images to make them look how i would like them to...I have resorted to using the images that i have taken of the blank spaces and adding in the portion of the projected image to remove the unwanted white box. But I still want to make them look more ghostly than they are turning out. So I need some ideas of what else I can do with them to achieve the look I want.

Here is an example of what the images look like now...