These are pertinent graphics that truly represent the Illuminati:
This is a partial title page from an Illuminati book from 1788. You can see their seal -- the Owl of Minerva (Roman myth) or Owl of Athena (Greek myth). The Owl was the insignia of the third degree which is the topic of the book. It is difficult to see but P.M.C.V. (per me caeci vident : through me the blind see) was to be cast or hand-graved as a jewel to be worn by Minervals. This is a photograph of a rare text title page which was reprinted in Freimaurer Solange die Welt besteht (Historisches Museum der Stadt Wien, 1993) at 314.The full title page is at this link, and the book's name was: Das verbesserte System der Illuminaten mit allen seinen Graden Einrichtungen, Frankfurt und Leipzig, 1788.
The original portrait of Adam Weishaupt.
Portrait of Wilhemsbad
The Big Picture provides this commentary:
Fundamental Laws - A Report on the 68th Convocation of The Rose Cross Order includes a whole chapter on the Great Seal of the United States. The introduction to that chapter includes the following paragraph:
"More than a year ago, Grace K. Morey, the author of the article "The Great Seal of the United States and Its Mystic Significance," prepared a skecth for a short primer of the Illuminati teachings, and in this sketch, as will be shown by the drawings, it was brought out that man is not only a threefold being, but that he is actually a four-fold being as well. In short that when he has succeeded in reaching Soul Illumination, he is the completed Pyramid or true Triangle."  Fundamental Laws - A Report on the 68th Convocation of The Rose Cross Order, 1916. http://books.google.com/books/about/Fundamental_laws.html?id=H-UNAAAAYAAJ
"An owl is included in the street map around Capitol Hill in Washington D.C. and a tiny owl is hidden on the US dollar bill." (The Big Picture.)