Change color is not working

It looks like Fourteen Colors is no longer active on your site; however, the issue might have been with your changes not being saved in the Theme Customizer. I checked your child theme and it correctly identifies Twenty Fourteen as the parent, so the plugin should run.

If you can’t get it working, you could adapt the CSS that’s generated in color-patterns.php in the plugin by manually substituting your colors and adding the css to your child theme’s CSS. Looking through that code should be helpful when creating a child theme.