Slate Dock is a free Desktop theme that allows you to change your Dock's appearance. It is downloadable as an iContainer format and requires CandyBar for installation.
The best part about it is that it's available for download in iContainer format, so it's easy to install. However, to do so, you'll need to have CandyBar on your computer.
Overall, Slate Dock is a great option for anyone looking to personalize their Mac desktop. It's simple and easy to install, and it can definitely give your Dock a new and unique look.