You should probably pick a theme elsewhere like Wordpress and then put it out as a job somewhere. I did that with the WP Light word theme and used slightly different colors on our site at China Helpers. You can the see WP theme on the home page (http://www.chinahelpers.com) and then the QA on the Tip section (http://www.chinahelpers.com/tips.
Try this one http://question2answerthemes.blogspot.in/2012/02/best-question2answer-theme.html
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May 7, 2020: Q2A 1.8.4 released!