Just to complete the thought, here’s another that fits into the “grid of little shapes” category. What’s interesting about this, though, is that it seems to be the design for all the Penguin Modern Economics covers. There were a bunch at the (awesome Bellingham, WA) bookstore where I found this, but I just got the one with the weirdest color combo.
There are two other interesting things to note: It’s the first time I’ve seen them use Univers, and the designer’s name is B.E. Rockett—which might actually be the coolest aspect of the cover.