Our website provided a free download of ThemePark 4.1 for Mac. The default filename for the program's installer is themepark-4.1.zip. This free Mac app was originally produced by geekspiff. The bundle identifier for this application is com.geekspiff.themepark. The following version: 4.1 was the most frequently downloaded one by the program users. The application is included in Theming Tools.
From the developer:
Use ThemePark to create or modify the way Mac OS X looks, as well as to change the appearance of individual applications. Just draw titlebars, buttons, and other widgets in the graphics editor of your choice, and move them into ThemePark to create a new theme or modify an existing one. Also use ThemePark to safely apply themes to your operating system.
You may want to check out more software for Mac, such as Wally or CloudyTabs, which might be similar to ThemePark.