By default, no Pattern is shown on the header's background. The Pattern property defines the pattern to be shown on the header's background. The Color property specifies the header's visual appearance / background color. The HeaderLaneInheritLane property specifies the visual properties that the header inherits from its lane. The HeaderPattern property specifies the pattern to be shown on the pool's header background.

The following screen shot shows the header of the lane with a different pattern/color: