Distinction between active/inactive windows (titlebars) with Windows 7 Aero

Title bar colors simply don't exist in Aero. Nor are they an indicator for the focus state of an application.

In Aero, there is no distinct title bar. There is just the window chrome, which is the background for the whole window. Now, there is only a single color to be defined that is applied to the whole window.

Focus state of an application is communicated through drop shadows on the window and the colorization of the chrome elements.

If you think the effect is too subtle, you can only adjust it through this slider:

If that's all still too boring for you, maybe something like Aura is for you.