This project extends the sassy module to support creating a Zen sub theme using a PHP CSS pre-processor reducing having a dependency on Ruby for development.
Drupal's Style guide module contains a Style guide palette sub-module, which stores color swatches in the database and displays them on a separate page from the main style guide. However, themers who develop with CSS pre-processors like SCSS or LESS often store colors as variables inside the stylesheets themselves, and these colors may change as the project evolves (meaning that a database update would need to happen each time a color changes).
If you'd prefer to store your colors only in the CSS, this module is for you! Style guide: CSS palette allows themers to add color swatches to the styleguide by implementing hook_styleguide() and associating class names with color names, then adding a few lines of CSS to your theme.