Polymer elements added to third_party/polymer.

third_party/polymer/components/core-style/my-theme.html

+<link rel="import" href="core-style.html">
+
+<script>
+
+  CoreStyle.g.theme = {
+    colorOne: '#abcdef',
+    colorTwo: '#123456',
+    colorThree: '#224433'
+  }
+</script>
+
+<core-style id="main">
+  body {
+    font-family: sans-serif;
+  }
+
+  section {
+    overflow: auto;
+  }
+
+  button {
+    border: 1px solid {{g.theme.colorOne | cycle(-50)}};
+    border-radius: 4px;
+    background-color: {{g.theme.colorOne}};
+    color: {{g.theme.colorTwo}};
+  }
+
+  button:active {
+    border: 1px solid {{g.theme.colorTwo | cycle(50)}};
+    border-radius: 4px;
+    background-color: {{g.theme.colorTwo}};
+    color: {{g.theme.colorOne}};
+  }
+
+  <template repeat="{{item in g.items}}">
+    my-panel:nth-of-type({{item+1}}) {
+      background-color: {{ g.theme.colorThree | cycle(item * -1) }};
+    }
+  </template>
+</core-style>
+
+<core-style id="my-toolbar">
+  :host {
+    border-bottom: 8px solid {{g.theme.colorOne}};
+    color: {{g.theme.colorOne | cycle(100)}};
+    background-color: {{g.theme.colorTwo}};
+  }
+</core-style>
+
+<core-style id="my-panel">
+  :host {
+    box-sizing: border-box;
+    background-color: {{g.theme.colorOne}};
+    border: 8px solid {{g.theme.colorOne | cycle(50)}};
+    color: {{g.theme.colorOne | cycle(-100)}};
+  }
+
+  :host(:nth-of-type(2n + 1)) {
+    background-color: {{g.theme.colorTwo}};
+    border: 8px solid {{g.theme.colorTwo | cycle(-50)}};
+    color: {{g.theme.colorTwo | cycle(100)}}
+  }
+
+</core-style>