d3.scale.category20() randomizer

d3.scale.category20.js

//paste in the console to swap out the d3.scale.category20() pallet
var oldColors = oldColors ? oldColors : d3.scale.category20().range()
var newColors = oldColors.map(function(){
  return '#'+Math.floor(Math.random()*16777215).toString(16) })

oldColors.forEach(function(str, i){
  //update inline color style
  d3.selectAll('[style*="' + str + '"]')
      .style('fill', newColors[i])
      .style('background-color', newColors[i])

  //update fill attr 
  d3.selectAll('[fill*="' + str + '"]')
      .attr('fill', newColors[i])
})

//save new pallet - press up arrow and enter to run again
oldColors = newColors

http://bl.ocks.org/mbostock/raw/4341574/

http://bl.ocks.org/mbostock/raw/7881887/