If I recall correctly, they entire "block" of audio is a light shade of color, while the actual audio in it is a darker color in PT.
I liked the way it looked. Tried to do colored tracks in Reaper and I think it just colors the audio itself. I'll have to play around with it more. I've always just used the stock setup where everything is the same color but it sort of gets fatiguing on the eyes and lets me get a bit "lost" in my project a bit quicker when I have a bunch of tracks going.