Monochromatic image: http://img.yessy.com/932124363-12562b.jpg
Analogous image: http://itp.nyu.edu/~jlc476/images/subway.jpg
Complementary image: http://evilvince.com/wp-images/Chicago_Bears_MXT_2.jpg
Duotone: http://img.webring.com/r/t/topblackandwhite/logo
