Thanks, grin, for now I've done a workaround.

The primary reason for wanting to get the color is to handle other platforms -- no matter where the app is running, the window next to the clicked button looks the same as the button. And also so it doesn't make the user ralph because the override I use doesn't agree with his/her color scheme.

This doesn't seem like a way-out request, among the hundreds of functions Qt provides for customization.