WordPress Theme: Fundamental
Grey, white and blue, the Fundamental theme is a 2-column theme is light and easy to look at.
This theme is meant to take advantage of the entire browser real estate available to it by making the sidebar utilize the remaining width. This makes it an especially interesting theme for blogs which have lots of content in the sidebar that expands horizontally.
Apart from this it really a minimal theme ( compressed file size 9KB, uncompressed size 13KB approx).