Thats exactly what makes this trick work.
Well also quickly walk through the Windows way of doing it, for the beginners in the crowd.
Now that we have that out of the way, lets move on to the fun part… Before we begin, make absolutely certain that your wallpaper is the same dimensions as your desktop.
This wont work very well otherwise.
Choose a color, and drop it on there.
Now go and assign that image as your wallpaper… youll see the taskbar has completely changed.
And thus we have learned the very stupid geek trick behind changing the Taskbar color.