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It's kind of hard to picture Pac-Man without the brightly colored ghosts today, but when the game was being developed, Iwatani says he was pressured hard to change that.
The president of Namco ordered him to make the ghosts a single color - red, to be precise - since she believed players would be confused that some ghosts, perhaps, were Pac-Man's ally.
Iwatani refused the order and on questionnaires to the game's testers, asked if they would prefer a single color ghost or four. Not a single person wanted the single-color option. That ultimately convinced the president she was wrong.

http://games.yahoo.com/blogs/plugged-in/...n-443.html

P.S. I just noticed the power pellets seem missing because the picture was taken when they flashed off.
Here is a more edit to that pic, followed by another edited pic I took the power pellets from:

That's an interesting read !