Did you know it's possible to bring back the old Tiger and Panther Aqua theme back to Leopard? You can do it in one simple step - type this in Terminal.app (/Applications/Utilities/Terminal.app):
defaults write -g AppleUseCoreUI -bool NO && defaults write NSGlobalDomain NSUseLeopardWindowValues NO && killall Finder
If you quit and restart all open applications, you'll see they have the old window decoration. If you want to complete your experience, follow these instructions to get a Tiger-like opaque menu bar and a transparent dock.
To undo changes, change NO to YES, and vice-versa if necessary.