First I had to size all the photos so they were exactly the same size and perfectly round. Then I printed them out on good satin finish photo paper. I glued each photo onto a backing of black pearlescent card stock for extra stability then cut them out. I recently bought a circle cutter, which helped keep them nice and round. I made two covers just a tad larger, also with a rose window photo, then added a black disc label with the word "Rose" spelled out in smaller circles.
The binding is merely a length of sturdy black linen thread sewn through a hole dead center in each disc, with an irridescent bead knotted onto each end. You can pull the window pages well open to see the detail in each window. When closed, the excess thread is tied around the book and wrapped around the beads.
I have to admit, this came out much nicer than I thought it would.