Not pages, frames.
You can do it using a
single page only - not even chapters. That's not to say that you can't have additional pages or chapters, just that to achieve your standard background - everything would have to be on the one page. Once you change, you lose it.
I might be wrong, but I think the problem is that flex lacks the ability to specify a colour to an object such as a vector or frame. But you could simply have the same multi-frame of colours on every page and then you might be able to use a variable and IF / CASE statement to change to the correct frame on each page load.
Personally, I'd rather stick to the PC and suffer the wrath of the mac users sorry mac user!
Mack