This is lovely. I've hand-coded solutions before to show two variables by region simultaneously (e.g. voting patterns by socio-economic levels:http://imgur.com/

This is lovely. I've hand-coded solutions before to show two variables by region simultaneously (e.g. voting patterns by socio-economic levels:http://imgur.com/ww1WV66 http://imgur.com/ww1WV66). Colour and texture are nicely independent for showing this stuff.