My goal was to provide a way to use every color you want, so you can adapt your Material Design Lite website to your specific colors.
Since version 1.0.2 of the Material Design Lite it works well, because only five color-variables inside the template CSS are replaced. Latest tested version is 1.2.1.
You only have to paste the template CSS of the Material Design Lite Project into the "Template CSS" textbox.
The template CSS can be created the following way: You have to clone the GIT-Repository, or download an actual release and build it with Gulp (Node.js is also required).
You have to type "gulp styletemplates" into your command line to create the necessary "material.min.css.template" file which is located inside the "dist" directory.