Download the Hi-Res 512px Leopard-compatible Adobe CS4 Fraktur Icon Pack!
Here’s how to replace the icons:
Ctrl-click the application file → Show Package Contents; Open Contents → Resources and replace the icons therein — or use CandyBar. Restart Finder, Dock, or both and you should be done.
You might want to back-up your standard icons before replacing them.
Icons were created using Wieynk Fraktur Bold, available with the book Fraktur Mon Amour.