I like the way this person has set up a page of post-its in the back of his Moleskine, so much so that I had to try it myself! Unfortunately, when I did it in a hardcover Moleskine, I felt like the notebook wouldn’t close far enough. In a softcover notebook, the flexible cover allows it more easily, especially inside the front cover. I’m just finishing my softcover notebook and about to switch to only using a hardcover, so I’m out of luck for now– I will just have to be satisfied with just a very thin layer of plain post-its and no multi-colored flag holder!
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Overlap two or three of each color and use the whole page. Works great.