I would like to extend this.
So the forum titles as seen on category_view or any forum list
and thread titles in those forums
all display with the same link colour on the Title as the top level Category Title colour.
So everywhere the visitor goes the colour of the links tells them which Category they are in.
Not sure if it will be possible to have a rainbow of colours on What's New/ Watched Threads/ Recent stuff
but one can dream!