app/views/parties/index.html.erb
<div class="page-header">
<h1><%= Party.model_name.human(count: 2).capitalize %></h1>
</div>
<div class="row">
<ul class="thumbnails">
<% @parties.each do |party| %>
<li class="span2">
<%= link_to party do %>
<%= image_tag party.logo, alt: party.name + 's logo' %>
<% end %>
</li>
<% end %>
</ul>
</div>