We'll create fresh WordPress site with Styles: TwentyFifteen installed. You have 20 minutes to test the plugin after that site we'll be deleted.
This plugin adds suport for the TwentyFifteen theme to the Styles plugin.
About Styles TwentyFifteen
Using this plugin with the Styles plugin you can instantly change the style of the TwentyFifteen theme from the customizer.
Features of the plugin
Styles and options for all built-in WordPress themes are free. More themes are available at StylesPlugin.com.
Free Themes
Developer Resources