Getting mouse over GUI event

I want to get that event so I'll know when mouse is over ANY part of GUI (anything drawn in OnGUI() function).

It's not for getting rollover effect on button texture (I know that you can get that with GUIStyle).

Is there any better way than just checking all Rects I used to draw for Rect.Contains(Input.mousePosition, for Y axis it's: Screen.height-Input.mousePosition.y accualy)?

Something like GUILayoutUtility.GetLastRect() but for freely drawn (not in layout) gui elements?