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create a block macro
[% MACRO alt_color(loop_count) BLOCK %]
...
[% FOREACH thing = things %]
  <td class=[% alt_color(loop.count) %]>[% thing %]</td>
[% END %]

<tmpl_loop name='things'>
  <td class=<TMPL_IF __ODD__>color<TMPL_ELSE>color2</TMPL_IF>> thing</
+td>
...

you need to make sure you have loop_context_vars set to 1 in H::T to h
+ave access to __ODD__/__EVEN__