Grids are a simple way to add lots of photos to your pages and keep it looking tidy. Plus, it's fast, because you know what you have to work with.
I got 9 pictures on this two page layout, but keeping the photos squared, and the lines clean, it doesn't look cluttered.
This layout features photos of Montreal's architecture. There are 14 photos of buildings on this two page layout, but it's grounded with a solid stripe along the bottom, with three clusters of elements to guide your eye from the top left, down to the bottom left, and across to the bottom right.
Even if you use a grid for your photos, feel free to add layers elsewhere, with papers, embellishments, tags, and titles, as I did above. Notice the border is a zipper??
And if your pictures are straight and centred, you can still add some angles to other elements on your page, as I did with the title above.