Well, aside from that Linux gives you the freedom to customize your desktop theme... There are also lots of third-party applications available for Linux that make your desktop go WOW!
One of those is AWN (Avant Window Navigator). It is a dock-like navigation bar for the Linux desktop. Look at the image below:
Well, this navigation bar allows you to add applications that resides on your desktop for fast and easy access. Also, all opened applications are automatically appeared in this navigation bar. So, its just as like as a taskbar.
You can place this navigation bar on top, bottom, left, or right of your desktop.
It also offers lots of icon effects and themes. You can also customize its appearance settings.
To install AWN, just open Ubuntu Software Center (Application->Ubuntu Software Center), search for AWN, then install it.