Nice to see someone pick a fight with Unwise for Flag Supremacy.
That said I don't think I'll be using your mod as it is. Some of the icons are very large (or tall). They make the map look crowded in my opinion. Try testing out various sizes to see what format you like the best. Then use the same size for all the icons rather than different for each nation. If you want to use icons that are tall and thin then you might want to tilt them a bit to the right.
The fewer colors the icon has the better. Flags rarely have more than three after all.