Can I change the appearance of my Windows in Gnome?
 

I have installed Fedora 18. I notice that all the windows I have open have a light gray title bar. The window which is 'in focus' has the window title in black and all the other windows have their titles in mid-gray.

Is there any way to change the appearance so that there is a more pronounced difference between the in focus window and the others?

Click here this may help you.

Try installing gnome-tweak-tool also.