I have found the values-centered (principle-centered) temperaments, from the book, The 7 Habits of Highly Effective People, to be especially interesting. I believe these values-centered temperaments can be observed and gleaned from people's appearances. I won't go into details for each one (though might provide the information from the tables found in the book, at a later time), as that can be found online and in the book. The values-centered temperaments can be used to find what someone's interests are, and explain why they do the things they do. The values-centers are listed as follows:
Career or job-centered
Church or organization-centered
While principles-centered might not appear to fit in with the rest, certain people do live by principles, which often comes from society, books, and family (this appears to be especially the case for ISTJ).