Nice feature. I have noticed that my efficient Saurian boffs have lots of different coloured borders that do not match for some reason. Had a V Rare in my roster which I assigned to test and it turned out to have a white border.
There were some interesting colours there certainly. The main thing that I noticed was that some of my unique Bridge Officers were coloured strangely. Both my Veteran and my Cross Faction boff were coloured green.