What to do with the blank walls over the sofa

For months the wall over our sofa has been blank.  I can't decide exactly what to do.  Or maybe the problem is that I know what I want to do, but I don't dare commit.  I want to do a collage of frames, which involves a lot of planning and a lot of nail holes (plus a lot of spackle to fill in all the "oopsy" nail holes).  I recently saw this photo and have decided whoever did this was a genius.  I think it will be the only way to figure out a layout that works (hopefully the first time).

Here are some of the many photos I've found for inspiration:

from Elizabeth Bauer Design

from photographer Stuart McIntyre

 

I'm sorry I don't have credits for all the photos.  Many of these I started saving long before I thought I'd be posting them on a blog. 

If anyone else have photos or ideas of this application, please feel free to share with me!