I really enjoy the effects of the background. The Calligraphy is outstanding as well, and the nice curves and visual ornaments fit very well with the colored background shapes. Very neatly done, and good lettering style.
Times New Roman by Pedro Javier Arbelaez. This poster in particular is a favorite of mine. I assume this poster goes through the history of Times New Roman. What's great is that Times New Roman is the only typeface used here.