Simplit Subreddit Theme by /u/titleproblems
This free to use subreddit theme is made to give a simple and clean design to subreddits. It does not contain any image sprites, so all you need is to copy the code and paste it in your subreddits stylesheet.
Get the css here: https://github.com/titleproblems/simplit/blob/master/stylesheet_v1_23May14
Screenshot: http://i.imgur.com/kqJxMk8.png