Photo Gallery?

Our new place is going to have A LOT more wall space than our current one. Good for arranging furniture, not so good for trying to figure out what goes on the walls. Currently we have zero wall space, which means we have just about nothing to hang in our new space and I really hate empty walls.

I'm trying to think of ways to decorate on the cheap, which of course led me to photo galleries. I was thinking of doing one above our couch, like this:

And here are some of the pictures I was thinking about using: