I did this one not long after Jack Layton died. I posterised a photograph into the traditional NDP colours of orange, with black and white, then overlaid his famous quote.
The source image was Creative-Commons-licensed to allow reuse. Source: http://flickr.com/photos/8466254@N03/5671247756. By Matt Jiggins, via Wikimedia Commons. License: CC-BY-2.0 (www.creativecommons.org/licenses/by/2.0).