As with Windows 7 taskbar icons, there are several ways that you can customize Windows 7 taskbar itself. Right-click a blank area of the taskbar and select Properties. In the Taskbar Appearance section, you can choose to lock the taskbar, auto-hide it, change its location on your screen or combine taskbar buttons.
If you want to resize the taskbar, make sure that it is not locked first. Point your mouse to the upper border of the taskbar until your pointer becomes a double-headed arrow. Then click and drag the taskbar so that it becomes wider or more narrow.
To add a toolbar to the taskbar, right-click an empty area of the taskbar, point to Toolbars and select a toolbar from the list or choose New Toolbar to add a custom toolbar.
Finally, you can customize Windows 7 taskbar by changing the color or the transparency of it. Right-click a blank area of your Windows 7 desktop and select Personalize. Click Window Color at the bottom of the Personalization window. Click a color under Change the Color of Your Windows Borders, Start Menu and Taskbar to customize the taskbar color. Clear the Enable Transparency check box if you do not want to view your desktop background through the taskbar. Use the Color Intensity slider to make the taskbar color more or less intense. When you are done, click Save Changes and close the Personalization window.