1. Download ObjectDock here (Go to the page and click the "Free Download" button.)
2. Install ObjectDock on to your computer.
3. Once installed, lunch ObjectDock (if it hasn't launched already.)
4. You can get thousands of icons for your dock here
ObjectDock is very easy to use and there is a lot of support out there for this free product; go to the ObjectDock website and click Forums.
Hope this tutorial helps. Enjoy a new look of your windows desktop!