Contributions to crds-styles
and/or crds-styleguide
(the DDK) are encouraged and may be facilitated through Github's pull-request feature.
If you don't have publishing rights to the repository you'd like to contribute to, simply fork the repository to your own account and submit a pull-request that describes the nature of your changes and what features and/or defects it addresses.
Or you can just send an email to design@crossroads.net.