Apologies for the delay in responding to this one. The answer is yes - Actinic allows you to create a range of 'overall layout' templates and then specify them on a section by section basis (within the 'Layout' tab of your sections).
Go to 'Design | Options | Layouts' and click 'Edit' next to the 'Default Overall Layout' field. Save it as 'Act_PrimaryHalloween.html' or something and then make the necessary changes.
You can then select this template for your halloween section.
The Advanced Guide gives you more specifics on editing the background - check out the chapter on 'Having Different Background Colours/Images for Different Pages'
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