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It would be pretty cool if he it make his could available on github so others could do the same at their cities.

I looked around. and found this http://jsfiddle.net/xLF38/

Hope it's helpful.

a bug fix:

`document.body.style.backgroundColor = 'rgb('+rgb.r+','+rgb.b+','+rgb.g+')';`

should be

`document.body.style.backgroundColor = 'rgb('+rgb.r+','+rgb.g+','+rgb.b+')'; `

Weirdly on that demo it derived an average color of green even though the pic looked to be 80% blue.

hence the fix.