Personally, I think too many different colors is more confusing than no colors. Fewer colors also means all the colors you use can be easily readable and distinct enough that if, say, the author of this mod were partially colorblind, he could avoid using colors he has trouble telling apart. I'm thinking something like:
- 1 for combat (wins, losses, promotions, war [if I can get this to work])
- 1 for builds (units, buildings, projects)
- 1 for city stuff (founded, growth, razed, borders, acquired, lost [last two coming soon!] -- may get combined with previous)
- 1 for religion (founded, spreads)
- 1 for technology
- 1 for everything else (tribal village, golden age, great people -- may get combined with previous)
- 1 for a new feature, perhaps
That makes 4-6 for current and upcoming features, depending on if I collapse where indicated. And I'm leaving the open spot for diplomacy, if I can get it to work.