The example in the sidebar uses a single typeface but it's far from boring with its four different members of the same type family.
Notice the angled ampersand that bleeds off the edge. It uses size, color, and placement to add interest. The nameplate uses two different fonts* from the same type family but also uses the contrast of lower and upper case characters to grab attention without destroying the simplicity and cohesiveness of a single typeface document.
*Font is used here in the original sense where font refers to a specific typeface in a specific point size and style.