I think you’re talking about paper brads.
https://www.google.com/search?q=paper+brads&client=safari&hl=en&tbm=isch&tbo=u&source=univ&sa=X&ei=iohuUdTOK6rC4APi8oC4AQ&ved=0CD0QsAQ&biw=1024&bih=644
Some a just plain paper fasteners. Some get really decorative.