AeroWorks Free is a Windows 7 taskbar customization utility that allows you skin Windows 7 taskbar without playing with system files. AeroWorks free allows you customize Windows 7 and Vista taskbar in a few clicks.
Once you run this software, you will be able to choose a skin from the available set of skins. You can revert to the default Windows 7 taskbar using the Restore Taskbar button. To enable a new skin, select a skin from the left pane, and then click load this skin button.