Even though they are bare bones, they still require some design knowledge to be very successful. The usage of typographic hierarchy and grids can be seen in all of them - some more successful than others.
Being simple is just as hard as creating more 'fancy' objects, I would suggest having a look into swiss design/ new international style where your sure to be inspired and help see just how people use layouts and typography to create simple designs which work.
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Even though they are bare bones, they still require some design knowledge to be very successful. The usage of typographic hierarchy and grids can be seen in all of them - some more successful than others.
Being simple is just as hard as creating more 'fancy' objects, I would suggest having a look into swiss design/ new international style where your sure to be inspired and help see just how people use layouts and typography to create simple designs which work.
Just to be clear, I wasn't equating simple with easy.
Thanks for the tip re: swiss design. More info: http://en.wikipedia.org/wiki/International_Typographic_Style