diff --git a/package.json b/package.json
index 6a5cf0f..d619ed9 100644
--- a/package.json
+++ b/package.json
@@ -20,6 +20,7 @@
     "canvas": "^1.6.2",
     "chance": "^1.0.4",
     "express": "^4.14.0",
-    "node-gyp": "^3.4.0"
+    "node-gyp": "^3.4.0",
+    "uuid": "^3.0.1"
   }
 }
diff --git a/server.js b/server.js
index 4428065..344884b 100644
--- a/server.js
+++ b/server.js
@@ -1,25 +1,36 @@
 var fs = require('fs');
 var express = require('express');
+var uuid = require('uuid/v4');
 var Canvas = require('canvas');
 
 var Fox = require('./js/fox.js');
 var renderFox = require('./js/render-fox.js');
 
+function composeImage(width, height, seed) {
+    var fox = Fox(width, height, seed);
+    var canvas = new Canvas(width, height);
+    var ctx = canvas.getContext('2d');
+    renderFox(canvas, fox);
+    return canvas;
+};
+
+function writeFoxToDisk (width, height, seed) {
+    if (seed === undefined) seed = uuid();
+    var canvas = composeImage(width, height, seed);
+    var fileName = "fox-" + seed + ".png";
+    var filePath = __dirname + '/images/' + fileName;
+
+    fs.writeFile(filePath, canvas.toBuffer(), function(err) {
+        if (err) console.log('error', err);
+    });
+
+    return fileName;
+};
+
 function writeFoxesToDisk (width, height, n=10) {
     var fileNames = [];
     for (var i = 0; i < n; i++) {
-        var canvas = new Canvas(width, height);
-        var ctx = canvas.getContext('2d');
-        var fox = Fox(width, height);
-        renderFox(canvas, fox);
-        var fileName = "fox" + Math.floor(Math.random() * 10000) + ".png";
-        var filePath = __dirname + '/images/' + fileName;
-
-        fs.writeFile(filePath, canvas.toBuffer(), function(err) {
-            if (err) console.log('error', err);
-        });
-
-        fileNames.push(fileName);
+        fileNames.push(writeFoxToDisk(width, height));
     }
     return fileNames;
 };
@@ -29,10 +40,26 @@ var app = express();
 app.use(express.static(__dirname + '/images'));
 
 app.get('/', function(req, res) {
-    var fileNames = writeFoxesToDisk(400, 400, 30);
+    var fileNames = writeFoxesToDisk(200, 200, 28);
     var images = fileNames.map(fileName => '<img src="/' + fileName + '"/>');
     res.send(images.join(''));
 });
 
+app.get('/:width', function(req, res) {
+    var width = parseInt(req.params.width);
+    if (!width) width = 400;
+    var fileName = writeFoxToDisk(width, width);
+    res.send('<img src="/' + fileName + '"/>');
+});
+
+app.get('/:width/:seed', function(req, res) {
+    var width = parseInt(req.params.width);
+    var seed = req.params.seed;
+    if (width === undefined) width = 400;
+    if (seed === undefined) seed = uuid();
+    var fileName = writeFoxToDisk(width, width, seed);
+    res.send('<img src="/' + fileName + '"/>');
+});
+
 app.listen(process.env.PORT || 3000);
 console.log('listening on http://localhost:3000');