Also aside from setting class and subclass for the elements.
You can also try creating your own list template style.
Just copy the default listtemplate found in packages/acs-templating/resource/lists/
and edit it from there.
Another thing you can do is something similar to this:
display_template {
<if @tasks.status@ odd>
<a class ="odd" href="@tasks.item_url@">@tasks.title@</a>
</if>
<else>
<a class ="even" href="@tasks.item_url@">@tasks.title@</a>
</else>
}
