How about using the pretty way rogues are displayed (you know the nice gilded frame) for something else: Insert the picture of a race's leader and show the result on a race's main building.
For me, this would achieve multiple things:
a) More visual representation of actual individuals of a race as opposed to their buildings directly on the screen I see most - the map
-> more "personality" for the races -> always good in my book
b) An easy to find indicator to locate a race's HQ
-> I often find myself hunting for these by examining building details -> time consuming and not so fun
c) It would look awesome I think and provide much needed (in my book) flavor
d) It gives the leaders a location on the map, which again is less abtract and gives the player the possibility to think something like: There he sits! Wait **** I will come an get you!
For even more utility this could also be extended by showing the bubbles on the edge of the screen in case the capital building is off-screen to indicate in which direction the respective capital is located. Would be useful for navigation, especially if playing with a zoomed-in view.
Mantised
here.