Add a parallax image behind a page entry header in Genesis - pure css solution. (You'll need to style your image to be tall enough to match the webpage header, so it is behind the main page header on scroll)
Code Snippets
Saving useful code as I find it, build it, or stumble into it.
Specific Page Sidebar with Genesis
Create a sidebar for a specific page with the Genesis Framework, without a new template file.
Alternate Sidebar Page Template in Genesis
This allows you to use the built-in secondary sidebar as an alternate on one sidebar themes (you'll want to register a separate sidebar if you are using two sidebars in your theme layouts). This has a limited scope, I would recommend a plugin like Display Widgets if you are going to have a more complicated page-by-page application.