FYI: I am Using the github master of tt-rss.
There are a lot of old Google Reader user out there who are missing the look and feel of our favorite news reader for years, so I decided to share my work.
As of 2013/08/29 the theme is build from scratch to be independent from changes to the tt-rss default.css.
You can get the theme from GitHub.
This is what it looks like (2013-08-29 | tt-rss v1.9):
![Image](https://raw.github.com/naeramarth7/clean-greader/master/img/preview.png)