I have a rather complex set of rules for changing colors based on various events, along with an implemented PyGridTableBase.
It's ugly, but if you want advice, ask!
http://www.lind-beil.net/pedseer/
Good luck!
Gregg
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Gregg Lind, M.S.
Division of Epidemiology and Community Health
School of Public Health
University of Minnesota, United States
Author and Maintainer: PedSeer Pedigree Analysis Suite -- http://www.lind-beil.net/pedseer/