Zefir is a Clean, Simple, Flexible, Fully Responsive & Retina Ready WordPress Theme. It is powered by the Slightly Modified Options Framework (by Syamil MJ), which provides tons of options to manage and modify any aspect of the theme: layout, styling, colors, fonts and much more
Demo: http://themeforest.net/item/zefir-simple-and-clean-wordpress-blog-theme/7650213