The patterns, in case there were patterns used in a template, are referenced in the KRA-File from which the template is made.
Here you can find an example where patterns are referenced in a KRA-File:
It is the “Watercolor Page A5 300DPI” that I’ve fixed and improved, but it was initially made by @Pesi as an additional “goodie” to his superb Watercolor bundle.
In case one would like to make a template out of this paper/bundle-combination and then want’s to put this template into a bundle, you have to read out the referenced patterns and add them to the bundle. And you have to read out every template’s KRA-File, so that you don’t miss if it has patterns referenced.
The description how to install it can be found in the following post by me:
By the way, in the course of that topic, Pesi bemoaned that templates couldn’t be bundled currently. 
In case of further questions, don’t hesitate to ask me, I’ll try to answer them as good as possible. I tend to miss (something) some things sometimes.
Michelist
And now it is time to sleep, it is 6am, ouch!
Add/Edit: Download link renewed