Applying masters to certain pages

Question

Hello, sorry if this question is confusing!
Basically I use books mostly. I use the contents page as my master document and all other docs sync with that.
What I would like to achieve is a variety of background faded images for each page. The way I thought achieve this was to say have 10 images which get applied in rotation to each page of the documents in the book.
I was gussing I could do this somehow with master pages but wondered if there was a way to make indeisgn apply the master to the document pages in rotation? I do not mind if it restarts for each document in the book if that would make it easier?

Answer 1

Jongware wrote:
Note that it relies on the page numbering being set to digits. It will not work if you somewhere used roman numerals or (abc).
@Jongware – we can overcome this little hurdle, if we use "documentOffset" instead of "name":
for (i=0; i<app.activeDocument.pages.length; i++){
    app.activeDocument.pages[i].appliedMaster = app.activeDocument.masterSpreads
                    Number(app.activeDocument.pages[0].documentOffset
                    )+i
                    % app.activeDocument.masterSpreads.length
Uwe