Gumby Framework on Rails
This is a simple example rails app with a working Gumby framework (gumbyframework.com) installation.
Click on the GRID and UI links on top menu to switch between the two example pages.
In order to customize Gumby you can directly modify app/assets/stylesheets/gumby files, but I prefer to override them in the separate folder app/assets/stylesheets/mygumby.
Put in app/assets/stylesheets/mygumby/_vars.scss your overrides of app/assets/stylesheets/gumby/var/_settings.scss values. Put in app/assets/stylesheets/mygumby/_style.scss your css styles.
Checkout live app at gumby-on-rails-demo.herokuapp.com/.