Thx for the answers so far
Well, I'm not sure how to say it better - I mean when I play CK with the original graphics there are many provinces with CoAs that show just two colors, for example purple-green, blue-green etc. Such CoAs seem to appear especially in the Middle East, while in most of Europe the CoAs look much more real and historically correct, since they also show real motifs known from medieval heraldry like eagles, lions, crosses etc.
The CoAs which show only two colors look a bit generic to me. They seem to be mostly for some counties (one I can remember was for example the county of Kerak), I have not seen them used for dukedoms or kingdoms so far. I wonder if there are other CoAs for those counties which would look better and which would show real heraldic motifs too (that I meaned by "real pics").