The obvious answer is concept cell phones with E ink displays. Despite their lamentable lack of color range, E ink mobiles are just all the rage these days. This concept from Anthony Reed stays a bit more inside the box with simplistic grid styling that keeps everything well within the gray scale range of the display.  When all you have to work with is black and white, maybe its best to embrace it fully instead of covering it up in flashy case graphics.

Designer: Anthony Reed