I'm running live knoppix 7.7.1 on a usb stick. I'd like to change the
appearance of the Title bar at the top of all Windows because I don't like the
appearance you get as standard. That is a very light bluey grey (or maybe it's
just grey) background, with watery white-with-outline text that you can hardly
see.

I'd like to change the Title bar to say a sky blue (or a bit darker) background,
with maybe black or white text, or at least a text colour that shows up.

Could you tell me how I do that please?

The window manager is Metacity, and the desktop environment is LXDE. I've tried
running lxappearance but this doen't change the Title bar appearance.