Besides the standard chartreuse over white and olive over white, I like the Ray's fly colors of olive over yellow over white, and pink over white.

I believe that Gary LaFontaine's Theory of Color is probably just as important in for imitating baitfish as it is for insects.
In a situation where the sun is setting and the sky turns pink, the pink over white works unbelievably well.... Probably the same reason why the chartreuse over white works so well in full light and at first light

The Ray's fly colors of olive over yellow over white seems to match a number of bait fish.. always good.

Another favorite would be yellow over white...a good match in large sizes for menhaden. I went nearly a full season one year using just yellow over white decievers of different sizes and profiles. An interesting experiment and not unfruitfull.