Here’s a good way to customize your Mac’s Dock from Beautiful Pixels. Commenting on the trend toward highly crafted customizations:

At first it was abstract stupid stuff that made its way to ‘dock sites’ like dockulicious and leopard docks, but it’s only later that serious designers put their hard work into creating some visually appealing and functional docks, perfect as a replacement to the grey dock that comes with your Mac.

You’ll need Panic’s CandyBar 3 but the results are stunning.