I just finished my own Jekyll theme for my blog. It is simple yet powerful. And it is based on the idea that "Content is the king". Only the content shines in this theme and there is no useless distraction.
Hope you guys like it and feel free to fork and use it.
The code is here: https://github.com/vinitkumar/Simple and you can check the live blog here: http://vinitkumar.me/Simple/