This is the actual image I'm using laid sideways to fit on the page so you can see it.
Make your image for your background ribbon. It will need to be a least 10 px wide then as tall as your page. Mine is 10px wide by 900px tall.
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Now click on "Page" at the top of VSD and then in the properties box on the right click on image and browse to your image you made for your background ribbon. Now click on "Settings" at the top of VSD then "Background fill Properties" then "Use Image". Now browse to the same image you used for your page background.
Here's the part of the image that makes the ribbon