Googstyle contains CSS and images extracted from Closure Library, converted to .scss (Sass - http://sass-lang.com/)
Googstyle is used by DemosMinerva: https://github.com/ludios/DemosMinerva
If your project needs CSS and images from Closure Library and Googstyle happens to be the right solution, please contribute and send pull requests.
Note that Googstyle is not affiliated with Google in any way.
Inclusion of any CSS or images not from Closure Library, unless they're needed to make Closure Library things work.