Newsprint is a minimal black-and-white WordPress theme and PmWiki skin, mostly shaped by whitespace; it has no graphics. The WordPress edition has one custom menu (in the header) and one widget area (the sidebar). The PmWiki edition supports (:noheader:), (:nofooter:), (:noleft:) and (:noaction:).
As of 2012-02-24, Newsprint is available on WordPress.org! Many thanks to Chip Bennett for clearing up the licensing issue.
For simplicity, both versions are available under the MIT license:
Copyright (C) 2012 Felix Pleșoianu Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Since Newsprint is so simple (essentially, the simplest WordPress theme that can possibly work), it may be most useful as learning material. In any event, if you download from here, you should browse through the code before installing it!