Sometimes if I have a LOT of pictures that I want to fit on just a couple of pages, I cut them all down to a basic shape and find some nice paper to back them with . . . instant layout! You can play with the colors, almost like playing with the fabrics of a patchwork quilt.
I did a similar layout where I did all circles, and the paper that the circles were mounted on overlapped slightly. The nice thing was I did not feel like I had to fill the page with embellishments . . . the papers did that for me.