Since Accessible Zen hit version 1.0, a lot has happened. I’ve released three minor updates, and added a child theme to the Accessible Zen Theme Pack.
Version 1.0.3 of Accessible Zen should hit the WordPress Theme Repository in the coming days. The changelog has all the details. The theme pack includes a child theme called Accessible Zen Dark. It features a light on dark color scheme that passes WCAG 2.0 standards.