This is a very useful article by Taras Bakusevych on UXPlanet.org about the do's and dont's of dashboard layout and design. DAshboard type, graph purpose, layout flow and margins are just a few things that should be defined before design is addressed.
Susan Kare created the original Mac icons at Apple. This is a nice piece on Milanote about her work, including the origins of the Command key icon (⌘), which is used in Sweden to denote an interesting feature and is modelled on an aerial view of a castle with four turrets.
Swedish designer Daniel Carlmatz challenged himself to create a typography logo that includes a hidden or implicit meaning everyday for a year. His results are great and can be seen here.I'm a sucker for a good negative space logo!