Sounds good.
Hmm, dudes on horse back and tanks?
When I first loaded this thread just now, I scrolled down to see your latest mockup and immediately thought, 'hey he added more colors'. The 50/50 dither looks just like pure light beige on my screen - a 19" CRT set to 1600x1200. I had to zoom in to figure it out. Even then, I went ahead and put yer new image on a lower res so I could actualy discern the dither pattern at 1x zoom to truly beleive what I'm seeing, hehe. Even if I tweak my monitor's color converganece settings it still looks like convincing light beige. This will be an unpredictable effect so I wouldn't count on it, though.