{$colors = [white=>'#FFF', black=>'#000', blue=>'#00F', green=>'#0F0', red=>'#F00']}

{foreach $colors as $color_name => $color_code}
    {if $color_name == "white"}  {* skip this iteration *}
        {continue}
    {/if}
    <span style="color:{$color_code}">{$color_name}</span>
{/foreach}