In some programs (especially mission-critical programs) it is often needed to
emphasise widgets. There are usually several ways to emphasise widgets: Red
background, to indicate an error or a critical action to be taken, green
background to indicate a successful operation, blue background to indicate a
common message, bolder background color to indicate menu paths on stacked menus,
flashing backgrounds and so on.
I know it is possible to hack a way to implement such emphasising, however, it
would be nice if it was part of the themes, with supporting API.

Itai.