How can you see the templates (backgrounds, patterns, illustrations) in individual stores?

The members of Zazzle’s Collaboration Content program are allowed to publish their own templates to be used within the Create tool and if you click on the backgrounds, you can see the name of the creator and the description of the content, but you can not see those templates in their stores. Is there some option to see those templates directly in the stores?

no.

The templates exist for wider community usage. Unless the creator uses them personally on their own products they won’t be visible.

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Ok, thanks @CreativeLeahG  

Do you need an invite to join Zazzle’s Collaboration Content program?

How can I create Zazzle “Elements” that customers can use?  These are the Departments under Weddings: Templates, Images and Elements - including Backgrounds and Patterns, etc

Thanks

Previously, the designer needed an invite to be part of that program for creating secondary content. We even had a special forum for all of us who were part of that program.

This is possibly a  starting point to answer part of your questions—
https://help.zazzle.com/hc/en-us/articles/360039941013-Secondary-Content-FAQ