And now, here we go-- Something Awful's echobucket has apparently found the files that need to be changed to edit the look of the dock. As with the triangles, the Dock elements have a few sizes to them, so replace the "scruve-x.png" files (where x is "l," "m," "sm," or "xl") in the Dock package's /Contents/Resources folder (make sure to back up the original files just in case, too), and then type "killall Dock" in the Terminal to restart it, and bingo, a slightly less bright dock.
In fact, just by changing the color of those pictures, you can change the color of the Dock itself (here's an orange dock on a black background for Halloween, via Digg commenter HacKing). It can't be too long before some enterprising programmer figures out how to put all of this inside an easy-to-use app, but here's the real question: if it's all this easy, why didn't Apple offer us this kind of customization ourselves? Sure, when you hand the paintbrushes to the people, things can get ugly, but they can also get much more beautiful, too.