jsbin.ketaqiwe.css

## jsbin.ketaqiwe.css
/* Put your CSS here */
html, body {
    margin: 20px;
}

.color {
  height: 200px;
  width: 200px;
}

## jsbin.ketaqiwe.html
<!DOCTYPE html>
<html>
<head>
<meta name="description" content="Wrapping localStorage in Ember Demo" />
<meta charset="utf-8">
<title>Ember Starter Kit</title>
  <link rel="stylesheet" href="http://cdnjs.cloudflare.com/ajax/libs/normalize/2.1.0/normalize.css">
  <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
  <script src="http://builds.handlebarsjs.com.s3.amazonaws.com/handlebars-v1.3.0.js"></script>
  <script src="http://builds.emberjs.com/tags/v1.5.0/ember.js"></script>
</head>
<body>

  <script type="text/x-handlebars">
    <h2>Wrapping localStorage in Ember Demo</h2>

    {{outlet}}
  </script>

  <script type="text/x-handlebars" data-template-name="index">
    <p>Pick your favorite color, then close this tab an come back:</p>
    {{custom-color colors=model}}
    <p>Also check <code>localStorage.color</code> in the Console.</p>
  </script>

  <script type="text/x-handlebars" data-template-name="components/custom-color">
    <ul>
    {{#each item in colors}}
      <li><a {{action setColor item}} href="#">{{item}}</a></li>
    {{/each}}
    </ul>

    {{input name="color" value=color}}

    <a href="#" {{action clear}}>clear</a>
  </script>
</body>
</html>

## jsbin.ketaqiwe.js
App = Ember.Application.create();

App.Router.map(function() {
  // put your routes here
});

App.IndexRoute = Ember.Route.extend({
  model: function() {
    return ['red', 'yellow', 'green'];
  }
});

App.LocalStorage = Ember.Object.extend({
  unknownProperty: function(key) {
    return localStorage[key];
  },

  setUnknownProperty: function(key, value) {
    if(Ember.isNone(value)) {
      delete localStorage[key];
    } else {
      localStorage[key] = value;
    }
    this.notifyPropertyChange(key);
    return value;
  },

  clear: function() {
    this.beginPropertyChanges();
    for (var i=0, l=localStorage.length; i<l; i++){
      this.set(localStorage.key(i));
    }
    localStorage.clear();
    this.endPropertyChanges();
  }
});

App.CustomColorComponent = Ember.Component.extend({
  color: Ember.computed.alias('storage.color'),

  createLocalStorage: function() {
    this.set('storage', App.LocalStorage.create());
  }.on('init'),

  actions: {
    setColor: function(value) {
      this.set('color', value);
    },
    clear: function() {
      this.get('storage').clear();
    }
  },

  classNames: ['color'],
  attributeBindings: ['style'],
  style: function() {
    var color = this.get('color');
    return "background-color: " + color;
  }.property('color')
});