Randomize two colors? Just two? it would probably be easier to ALTERNATE the colors. If you randomize only two colors, it will look like two colors changing at variable durations.
Well, randomize colors in what way? To what end? Using what method/ effect? Sorry, your question is far too vage. Before even beginning to think about expressions, I could think of a million ways to create all sorts of randomly flashing colors. And even if you were to use expressions, where would we begin? I could post code with 200 lines that creates all sorts of cool color variations, but it may be utetrly uselss to you. So by all means, provide more info - a lot.
I'm still not quite sure what you are trying to do. If you wanted to just change the colors of all 7 layers at once, all you'd need is an adjustment layer on top with a suitable effect (another instance of fill, Tint or whatever) and then apply something as trivial as a wiggle() expression to the adjustment's opacity. Anything else still requires some more detailed explanation...
I was able to do what I wanted. I added two fill effects to each layer. Then I took your suggestion and added a wiggle to the second fill effects' opacity.
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