In the latest issue of MacWorld, they list the Top 53 Inexpensive Mac Gems. Among those gems, I found a free program is called SuperDocker. This cool little app lets you customize your OS X Leopard Dock. You can choose between 2D and 3D modes, about 20 different Dock backgrounds, and a variety of separators and indicators. Changes are instant and the result is fun to look at. I just installed the program and am now using the wood background with the white triangle indicators, which resemble the more-obvious indicators used on the Dock in OS X Tiger. The novelty could wear off in time, but there are a lot of options to choose from, and the program is, after all, free.
Note: When you visit the website for SuperDocker, you’ll find that the site is in French. I wasn’t able to find an English version of their product page, but when you download the program itself, choose the version labeled “Anglais”, which is French for the English version of the software. Enjoy!