All the SeaMonkey themes located at the site below have just been
updated to support the Calendar XPI add-on (as of this post.)

http://www.projectit.com/freestuff.html

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Mozilla Tips: http://www.ufaq.org/ , http://ilias.ca/
About Mozilla: http://www.mozilla.com/
Mozilla Themes: http://www.projectit.com/freestuff.html