[i]And I used a table to control the layout a bit, although I realize that the CSS purists don't like tables but I think that purists in any field tend to be somewhat impractical.[/i]
I don't agree with that...:-) Use tables where you really need to present table data..:-)
If you don't mind my opinion, I don't think that the white background goes well with the colored boxes. Too much contrast for my liking.
But anyway, if you like you can attach the theme to this page on trac: http://www.zenphoto.org/trac/wiki/ZenphotoThemes (you need to register on trac first). We actually don't update the page itself since that is now run by Wordpress but we still use it as storage for third party themes. Then we can take a look at it. You may give your mod a proper name or suffix.
Regarding the zenphoto/zenpage copyright, that does not really matter since Zenpage is officially part of Zenphoto from now on anyway.