WordPress.org

Can i add more colors?

Yes, WordPress got a function for this : wp_admin_css_color() (check the codex) You have to create or copy+modify a existing CSS file to set your colors.

Can i add more icons?

Yes, i added a WP like function called : wp_admin_css_icon() wp_admin_css_icon( $slug, $title, $css_url, $pic_preview_url ); Example of use: wp_admin_css_icon( 'fugue', _x( 'Fugue', 'admin icon scheme' ), BAWBACT_PLUGIN_URL . '/css/fugue.css', BAWBACT_PLUGIN_URL . '/css/images/menu-fugue.png' );