<table border=0>
[%- FOREACH col = ['grey' 'red' 'green' 'blue' 'lavender'] %]
<tr>
  <td bgcolor="[% rgb.white %]">
  <b>[% col %]</b>
  </td>
  [%- FOREACH shade = ['dark' 'mid' 'light'] %]
  <td bgcolor="[% rgb.${col}.${shade} %]">
  [% shade %] [% col %]<br>(rgb.[% col %].[% shade %])
  </td>
  [%- END %]
</tr>
[%- END %]
</table>
</ul>