Here's an example of how to display a photo collection on a wall. This is my family picture wall, my favorite photo arrangement on a wall. As you can see, it's a slightly skewed diamond shape which lends itself very well to a large blank wall. This is located at the top of my stairs, so it's right in front of you when you get upstairs, yet it can also be admired from a distance (downstairs) as the area is open to the second floor and can be seen easily through the loft railing. Up until a few days ago, it was a more perfect diamond, but no new pictures had been added in a few years and I really wanted to update it without having to remove any pictures as they're all favorites, so I removed the two canvases at both ends, rearranged a couple of the existing end frames and added in about 5 more frames of varying sizes and shapes, then the canvases were placed back on the ends. It took a little bit of work to determine the best fit and, as you can see, I had a light switch to contend with, but I think it ended up great!
See more great ideas and examples here: Create a Photo Dsiplay