This blogger has started a project to model WW1 with all miniatures painted in shades of grey, because "since our collective memory of the Great War is largely dominated by black and white imagery it may be interesting to portray a miniature version using the same greyscale palette. I also think there is a certain cold, dehumanizing starkness to greyscale that may suit the mood of the Western Front. At the very least it shoud be an interesting excersize".