Using a list of countries generated by The World Factbook database, flags of countries fetched from Wikipedia (as of 26th May 2007) are analysed by a custom made python script to calculate the proportions of colours on each of them. That is then translated on to a piechart using another python script. The proportions of colours on all unique flags are used to finally generate a piechart of proportions of colours for all the flags combined. (note: Colours making up less than 1% may not appear)
It’s pretty, it’s something about proportion, it’s not trying to show clear numeric result, data-to-ink/pixel ratio is not a problem in this case, yet there’s some information that you will have hard time seeing from table. (Such as Tunisia has slightly more white then Turkey.)
Now I’m not for the alphabetical ordering of the countries, but then again I don’t have a better suggestion.
Is there any reason that no country uses pink?
This site has summary of what not to do with pie chart.
You can also look at this paper.