Here is the first book I made - simple, easy, and it holds a ton of ribbon. Each page holds 7 - 12 ribbons (less if really wide trim) It holds 2 -5 yards of ribbon per slot depending on the type of ribbon. Each book holds 6 to 8 pages depending on how much ribbon is put on per slot (bulk). On average it is about 70/80 ribbons at 3 yards a piece. That is 210 - 240 yards of ribbon per book!
I have been doing all my organizational items kind of in the same theme....black and white diamond paper from the Graphic 45 OCS paper with the orange butterfuly. I added metal corners because I thought that the books would have a lot of use and that would help them hold up to more abuse.
On the spine I added a TH Book plate so that I can mark the color of the ribbon(s) for easy reference.