Files for the version that is still bundled in Fantastico can be found here
http://www.dew-code.com/archives/ Files with language names, like "French.zip" are language files.
8-themes-4-SEF.zip has some admittedly ugly themes (I'm a coder, not a designer, but I have gotten better since I created these)
alt-themes.zip Aren't really themes, but layout changes. Since the style sheets from themes are interchangeable, you can pick a layout you like, then copy the style sheet and any required graphics to your preferred layout theme directory. With a few exceptions, editing the style sheet is all you need to do to tailor a theme.
The current version, which is only available from this site, has it's various add-ons here,
http://www.dew-code.com/component/option,com_jooget/Itemid,27/ but it also already includes most of the add-ons from the previous version.
I had really hoped that when this project was launched back in 2003 some other people would have gotten involved and contributed more, but for the most part, it's been a one man show. However, if you would care to create a Greek language file and share it with others, I'd gladly add it to the file archives.