I haven't read Green yet but the whole circle restarts with it. From what I've heard even though Green is the end you can read Black right after it as if it's a sequel. This way the books story-line actually form a circle. Black -> Red -> White -> Green -> Black etc. I'm not sure how the Lost books fit in (as they are about the Books of Histories as well) but I hear it's like a younger version of The Circle books. Also the Paradise novels (Forming part of the Histories) and House (Written with Frank Peretti and featuring a character from the paradise novels) all fit into the Circle as well. I hear you can read them in any order but I'm doing Black, Red, White, The Lost Books Series, The Paradise Novels, House and Green. I think that was the order they were written. Then The Books of Mortals is the new series that takes place after Green so that should be fun.
And I love similies. I love aliteration too. Is that crazy?
BTW Green comes in two versions. One subtitled "The Begining and the End" the other subtitled "The Last Stand". The former connected the stories with an ambiguous ending where the latter was rewritten with a more solid ending. Depends on if you like the idea that the books can be read in a circle forever. I do so I got the former.