Tour de Stamen in D3

Working from Mike's tiles-clipped-to-a-polygon example, I extended it for a unique tileset in each of several polygons.

<!DOCTYPE html>
<head>
<meta charset="utf-8">
<style>

svg {
  background-color: #333;
}

.stroke {
  fill: none;
  stroke: #222;
  stroke-width: .5;
}

</style>
</head>
<body>
<script src="https://d3js.org/d3.v3.min.js"></script>
<script src="https://d3js.org/d3.geo.tile.v0.min.js"></script>
<script src="https://d3js.org/topojson.v1.min.js"></script>
<script>

var width = 960,
    height = 500;

var projection = d3.geo.mercator()
    .center([-122, 48.7])
    .scale(7200);

var path = d3.geo.path()
    .projection(projection);

var tile = d3.geo.tile()
    .scale(projection.scale() * 2 * Math.PI)
    .translate(projection([0, 0]))
    .zoomDelta((window.devicePixelRatio || 1) - .5);

var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);

//USA!

d3.json("world-50m.json", function(error, topology) {
 var amurka = topology.objects.countries.geometries.filter(function(d) { return d.id == 840; })[0];
 var canada = topology.objects.countries.geometries.filter(function(d) { return d.id == 124; })[0];
 var mexico = topology.objects.countries.geometries.filter(function(d) { return d.id == 484; })[0];
 var cuba = topology.objects.countries.geometries.filter(function(d) { return d.id == 192; })[0];
 
  var tiles1 = tile();
  var tiles2 = tile();
  var tiles3 = tile();
  var tiles4 = tile();

var defs = svg.append("defs");

//USA!
  defs.append("path")
      .attr("id", "usa")
      .datum(topojson.feature(topology, amurka))
      .attr("d", path)

defs.append("clipPath")
      .attr("id", "clip1")
    .append("use")
      .attr("xlink:href", "#usa");

svg.append("g")
      .attr("clip-path", "url(#clip1)")
    .selectAll("image")
      .data(tiles1)
    .enter().append("image")
      .attr("xlink:href", function(d) { return "https://" + ["a", "b", "c", "d"][Math.random() * 4 | 0] + ".tile.stamen.com/terrain/" + d[2] + "/" + d[0] + "/" + d[1] + ".png"; })
      .attr("width", Math.round(tiles1.scale))
      .attr("height", Math.round(tiles1.scale))
      .attr("x", function(d) { return Math.round((d[0] + tiles1.translate[0]) * tiles1.scale); })
      .attr("y", function(d) { return Math.round((d[1] + tiles1.translate[1]) * tiles1.scale); });

svg.append("use")
      .attr("xlink:href", "#usa")
      .attr("class", "stroke");

//CANADA!
  defs.append("path")
      .attr("id", "can")
      .datum(topojson.feature(topology, canada))
      .attr("class", "land can")
      .attr("d", path)
      
  defs.append("clipPath")
      .attr("id", "clip2")
    .append("use")
      .attr("xlink:href", "#can");

svg.append("g")
      .attr("clip-path", "url(#clip2)")
    .selectAll("image")
      .data(tiles2)
    .enter().append("image")
      .attr("xlink:href", function(d) { return "https://" + ["a", "b", "c", "d"][Math.random() * 4 | 0] + ".tile.stamen.com/toner/" + d[2] + "/" + d[0] + "/" + d[1] + ".png"; })
      .attr("width", Math.round(tiles2.scale))
      .attr("height", Math.round(tiles2.scale))
      .attr("x", function(d) { return Math.round((d[0] + tiles2.translate[0]) * tiles2.scale); })
      .attr("y", function(d) { return Math.round((d[1] + tiles2.translate[1]) * tiles2.scale); });

svg.append("use")
      .attr("xlink:href", "#can")
      .attr("class", "stroke");

//Mexico!

defs.append("path")
      .attr("id", "mex")
      .datum(topojson.feature(topology, mexico))
      .attr("class", "land mex")
      .attr("d", path)
      
  defs.append("clipPath")
      .attr("id", "clip3")
    .append("use")
      .attr("xlink:href", "#mex");

svg.append("g")
      .attr("clip-path", "url(#clip3)")
    .selectAll("image")
      .data(tiles3)
    .enter().append("image")
      .attr("xlink:href", function(d) { return "https://" + ["a", "b", "c", "d"][Math.random() * 4 | 0] + ".tiles.mapbox.com/v3/landplanner.g9caodmg/" + d[2] + "/" + d[0] + "/" + d[1] + ".png"; })
      .attr("width", Math.round(tiles3.scale))
      .attr("height", Math.round(tiles3.scale))
      .attr("x", function(d) { return Math.round((d[0] + tiles3.translate[0]) * tiles3.scale); })
      .attr("y", function(d) { return Math.round((d[1] + tiles3.translate[1]) * tiles3.scale); });

svg.append("use")
      .attr("xlink:href", "#mex")
      .attr("class", "stroke");

//Cuba!

defs.append("path")
      .attr("id", "cub")
      .datum(topojson.feature(topology, cuba))
      .attr("class", "land cub")
      .attr("d", path)
      
  defs.append("clipPath")
      .attr("id", "clip4")
    .append("use")
      .attr("xlink:href", "#cub");

svg.append("g")
      .attr("clip-path", "url(#clip4)")
    .selectAll("image")
      .data(tiles4)
    .enter().append("image")
      .attr("xlink:href", function(d) { return "https://" + ["a", "b", "c", "d"][Math.random() * 4 | 0] + ".tiles.mapbox.com/v3/landplanner.gbn69pja/" + d[2] + "/" + d[0] + "/" + d[1] + ".png"; })
      .attr("width", Math.round(tiles4.scale))
      .attr("height", Math.round(tiles4.scale))
      .attr("x", function(d) { return Math.round((d[0] + tiles4.translate[0]) * tiles4.scale); })
      .attr("y", function(d) { return Math.round((d[1] + tiles4.translate[1]) * tiles4.scale); });

svg.append("use")
      .attr("xlink:href", "#cub")
      .attr("class", "stroke");
});

</script>
</body>
</html>

Modified http://d3js.org/d3.v3.min.js to a secure url

Modified http://d3js.org/d3.geo.tile.v0.min.js to a secure url

Modified http://d3js.org/topojson.v1.min.js to a secure url

https://d3js.org/d3.v3.min.js

https://d3js.org/d3.geo.tile.v0.min.js

https://d3js.org/topojson.v1.min.js