I will mention some technologies/resources we used in the new interface. Hope it helps others.

* For generating screenshots, we used the awesome PhantomJS http://www.phantomjs.org/

* Color scheme was decided using http://www.colorschemer.com/online.html and http://colorschemedesigner.com/

* We used fonts from Google Open fonts http://www.google.com/webfonts

* Icon set was discovered (and subsequently purchased) via http://www.iconfinder.com/

* We used jQuery heavily for AJAX based test creation and reports

* The charts developed using Flot library http://code.google.com/p/flot/

Would love to hear feedback on the new interface. We worked hard on this one :)