Js O1 is a beautiful orange-grey color WordPress theme without any plugins needed, widgets, threaded-comments and sticky-post functions supported. Valid CSS & HTML. Language localization supported, zh_CN, en_US etc. Visit the author's site for more details.
WP_EduBlog Theme is a minimal design which is suitable for education/school but can be used for other purposes. It is Widget ready and includes search and RSS which has valid XHTML and CSS. Pings are seperated from comments. Can work with or without navi plugin.