Circular Layout (Raindrops)

<!DOCTYPE html>
<meta charset="utf-8">
<title>Raindrops</title>
<style>

body {
  background: #012;
}

path {
  stroke: #fff;
  stroke-opacity: .5;
}

</style>
<body>
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
<script>

var width = 960,
    height = 500;

var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height)
  .append("g")
    .attr("transform", "translate(" + width / 2 + "," + height / 2 + ")");

var gradient = svg.append("defs").append("linearGradient")
    .attr("id", "gradient")
    .attr("x1", "0%")
    .attr("y1", "20%")
    .attr("x2", "20%")
    .attr("y2", "100%");

gradient.append("stop")
    .attr("offset", "20%")
    .attr("stop-color", "#ccf");

gradient.append("stop")
    .attr("offset", "50%")
    .attr("stop-color", "#1C425C");

gradient.append("stop")
    .attr("offset", "100%")
    .attr("stop-color", "#19162B");

// could use transparent gradient overlay to vary raindrop color
svg.selectAll("path")
    .data(d3.range(358))
  .enter().append("path")
    .attr("fill", "url(#gradient)")
    .attr("d", function() { return raindrop(10 + Math.random() * 200); })
    .attr("transform", function(d) {
      return "rotate(" + d + ")"
          + "translate(" + (height / 4 + Math.random() * height / 6) + ",0)"
          + "rotate(90)";
    });

// size is linearly proportional to square pixels (not exact, yet)
function raindrop(size) {
  var r = Math.sqrt(size / Math.PI);
  return "M" + r + ",0"
      + "A" + r + "," + r + " 0 1,1 " + -r + ",0"
      + "C" + -r + "," + -r + " 0," + -r + " 0," + -3*r
      + "C0," + -r + " " + r + "," + -r + " " + r + ",0"
      + "Z";
}

</script>

https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js