When setting a separator line between columns, it's colour cannot be defined, it
is always black. That can be annyoing when you have chosen to use coloured lines
elsewhere in your layout. The only workaround I am aware of is pretty ugly: draw
a vertical line in OOo Draw, export as EMF or similar, import it as background
image for the current page format, center it. :-(

After my opinion, it should be as easy setting the colour of these lines as it
is with fonts, and with border lines around objects.

I assume this feature (or lack therof) is platform-independent. Can check later
in Linux.

Kind regards

Andreas