These Creative Commons license portraits were funded in Kickstarter since 2010. The portraits were finished at 2011, available for anyone to use them in anyway we want, as long as we credit the source.
I've been recolouring some of them for my game in GIMP. They are life savers since I don't have enough time to draw characters from scratch.
Example of my recolour: http://img713.imageshack.us/img713/5416/meredith.png