I would like to have a set of links 

<li>
  <h2>Random Articles</h2>  
  <ul>
    <li><a href="#">Old article 1</a></li>
    <li><a href="#">Old article 1</a></li>
    <li><a href="#">Old article 1</a></li>
  </ul>
</li>

But I want to generate the links from a random selection of my posts. I'm using jekyll and liquid to generate the site. I must use built in parts of jekyll as I'm hosting on github. I'm not really sure where to start on this. Google searches on the topic are fruitless.

random jekyll liquid
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