This is another one of those very obvious tweaks you can do with your computer, but nobody notices them. A user on the Neowin forums took advantage of Aero Glass by placing rectangles of different colours on his wallpaper.
Since his taskbar was transparent, the colours just went right through, allowing an immediate colour change for your taskbar.
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Microsoft, Windows Vista, Customize, Customization, Colors, Taskbar, Tweaks, Tips