How do you change the colour of the "colour boxes" in themes?

Question

Creating a book in Aperture the various "Themes" offer you different layouts.  When you are in a Theme - is there a way to change the colours of the background boxes (Not page colour) - I have searched everywhere to see how to do this and a simple thing like this seems like it is not possible.  Yes you could make a photo of the correct colour you want and drag it in but surely there is a simple way of changing the colour of these theme boxes. 
The theme I am using is Special Occasion and I want to darken the lightblue boxes behind the text. 
Would appreciate anyone out there who could advise on this please, thank you in advance.
Richard
Apperture 3.4.3
iMac 21.5 OS 10.7.5
iMac 27 OS 10.6.8 (the best)

Answer 1

Richard,
there is no built-in option to change the color boxes. You can only change them by patching the Resorces in the Aperture application bundle, and that is risky.
The color of the background boxes is set in the property list (for the Extra Large Book):
/Applications/Aperture.app/Contents/Resources/Book Themes/Special Occasion/ExtraLarge/Graphics/BlueRect.plist
The current value is:
backgroundColor {224, 241, 238, 100}
To try what happens, when this value is changed, I edited it to {100, 200, 255, 100}
You will not really want to patch your Aperture application bundle
What you might try, would be to copy the "Special Occasion" subfolder of the Book Themes and to create your own custom theme from this and install it in your user library
~/Library/Application Support/Aperture/Book Themes/
-- Léonie