gistfile1.txt

--- rainbow.pl  2012-08-14 15:41:11.152540000 -0700
+++ rainbox.orig.pl     2012-08-14 15:54:49.358372000 -0700
@@ -62,10 +62,10 @@
             $newstr .= $char;
             next;
         }
-
-        $color++;
+               while (($color = int(rand(scalar(@colors)))) == $last) {};
+               $last = $color;
         $newstr .= "\003";
-        $newstr .= sprintf("%02d", $colors[$color % @colors]);
+               $newstr .= sprintf("%02d", $colors[$color]);
         $newstr .= (($char eq ",") ? ",," : $char);
     }