Eric- I've seen a number of color sided bikes. Some with a concise border and others with a hazy/faded border. I rarely thought they looked more then interesting. That we usually see bikes at a changing angle, unlike photos with a fixed viewpoint, means that the two sides are usually both able to be seen and the amount of one side or the other, and the changing color that is the majority, is to my eyes somewhat distracting. Dawes, IIRC, had some bikes in the early 1990s with a white and blue side by side pattern. Maybe it was the tints used (the white looked like it had a few drops of blue in it) but I always thought they looked cheap, like a painted woman
Tonight I have the pleasure to begin the what color(s) to paint the newly completed frames with my wife. Andy