Hi Bald Brick, QTCurve style is very configurable, but the decorations dictate the "glow". If I open the air-oxygen decoration.svgz it has the blue glow that windows receive.
I suppose I could edit the decoration, but Inkscape seems to have a steep learning curve ;-)
There are so many different kinds of decorations that I sometimes misunderstand what people are talking about. Some of them depend on the desktop theme (the "Window Decorations" settings under "Workspace Appearance"), some on the application style.
With QtCurve almost everything is configured under "
Workspace Application Appearance". The window decorations inherit the widget style settings. Other themes obviously work differently.
Anyway, if you want to control the shadows around the windows in QtCurve you'd do it under "Application Appearance". Here:

If you want to change the glow on mouse-over you'd do it here:

And if you want to change the look of the buttons you'd do it here:

And here:

You'd hardly ever have to change the desktop theme settings for the windows decorations (except to change the button
positions).
But as I indicated: other themes are more primitive.
Edit: Corrected typo.