The images stem from the following sources:

The Berkeley Segmentation Dataset and Benchmark (http://www.eecs.berkeley.edu/Research/Projects/CS/vision/grouping/segbench/)
    - church.jpg
    - desert.jpg

Wikipedia (http://en.wikipedia.org/wiki/Look_Mickey)
    - lookmickey.jpg (Copyright Board of Trustees, National Gallery of Art, Washington)

Own production
    - colors.png