My docks are in the OP at the bottom. As for other peoples docks I would suggest the forum for launcherpro. There are tons of backgrounds that others have created.
Oh, the pictures of them? So you just save them and apply them? Hmm, I never changed the dock before. lol Thanks for the heads up!
The easiest of all to change would be to use LauncherPro. It gives the ability to switch out .png files to use for the background and shortcuts used on the dock. Very easy to do.