Flags of the world as piecharts. Each sector of these piecharts is proportional to the area of the colour on the respective flag.

Using a list of countries generated by The World Factbook database, flags of countries fetched from Wikipedia 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.

Link (flags by colours)
Link (all flags combined)