Need beginner guide for changing taskbar color

[Shemhamforash]

Thanks, Mr. Grim. Actually, I had already replaced the Taskband images you cited. I double-checked, replaced again and no joy. It didn't work.
One final thought...is it possible the taskband inherits properties from another area that I haven't changed?

The locations Mr GRiM listed do in fact work. I'll add that to get the entire tasbar desaturated and not just the middle you will have to change the same named images mentioned by Mr GRiM in the location Taskbar & System Tray > TaskBar > Basic > TaskBar

1. Copy aero default theme to a new location
2. Untick enable desktop composition in Performance Options dialog
3. Open default theme in WSB, entered testing mode and export images:
Taskbar & System Tray > TaskBand > Basic > TaskBand > BackgroundBottom
Taskbar & System Tray > TaskBand > Basic > TaskBand > BackgroundTop
Taskbar & System Tray > TaskBand > Basic > TaskBand > BackgroundLeft
Taskbar & System Tray > TaskBand > Basic > TaskBand > BackgroundRight
Taskbar & System Tray > TaskBar > Basic > TaskBar > BackgroundBottom
Taskbar & System Tray > TaskBar > Basic > TaskBar > BackgroundRight
Taskbar & System Tray > TaskBar > Basic > TaskBar > BackgroundTop
Taskbar & System Tray > TaskBar > Basic > TaskBar > BackgroundLeft

Optional:
Windows & Caption Buttons > Basic > Controls > Captions > Window
Windows & Caption Buttons > Basic > Frames

4. Desaturate images and reimport them, refresh Testing Mode, save theme
5. Using Always Combine taskbar settings, the taskbar is desaturated