The reason I chose my entry was because it has a degree of abstraction which would have been impossible working in colour. The Quiraing are one of the most easily recognised features of Scotland's scenery, and the shot was taken from the exact same point hundreds or thousands of others have stood when taking their pictures.
Using the channel mixer with a predominantly green filter effect has resulted in an image which doesn't have the soot and chalk look popular in B/W landscapes, but also an image which isn't immediately recognisable. The abstraction only works in B/W, and the image can even be (at a glance) seen a Hokusai-esque wave crashing on cliffs. The scale has become lost in B/W, adding mystery.
That, for me, is the point of using black and white - abstraction, and the way it causes you to look at the details to find the 'truth.'