How about a color wheel or palette? You can choose any color for each of the (say) 7 slots, or however many slots there will be. Or a unique color for each civ. That will be solve any problems for the colorblind, such as myself. I never had any problems with Civ2's colors, but someone might have. And it would just be a nice feature for scenario makers: allied civs could have different shades of the same colors, for example; you could indicate blocs that way.
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