Building a Library of BRANDED Templates

I am looking to build a library of custom designed templates.  Where do you recommend I purchase these from to ensure they are branded with our company branding guidelines?  Essentially we are looking for a wide variety of pre-built interactions that simply require our Curriculum team to import and add text and images.  Functionality should be built in with intuitive instructions for a non-developer to easily use.  Thoughts?  Recommendations?

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