As we all know, colors were not discovered until sometime in the late 1940s to early 1950s. We have more than enough substantial photographic and video evidence to prove this. Colors first began to sporadically appear sometime during WWII, as we have very few videos and photos that are colored. This might have had something to do with radiation from a-bomb tests, beats me. Eventually colors became more common and sometime in the 1970s, they completely took over. Everything we see today is in color but let's not forget that back in the day everything was black and white or in shades of brown.
This leads me to my campaign suggestion: I think it would be good if everyone out there would finally build a model in an accurate black & white or sepia finish, exactly the way they were when they were in service. I never really understood what all the fuss was about with applying the 'correct' color to a model, there weren't any colors, look at the photos!
*Getting serious now*
I just think it would be a fun thing to paint a model in a b&w or sepia finish because frankly, I've never seen it done before. I haven't really considered a start date for this campaign or how long it'll run because I want to get some people's feedback first. Basically, you can enter any model, figure or diorama from anywhere between the late 19th century to let's say the Korean war. This was the time when black & white photos were still the most common. I'd open it to all scales.
So: the final result of a model, for example should look like this:

Please post feedback and suggestions!
Sebastian