I have read:

</font><blockquote><div id="quote"><font class="small">Quote:</font>
An orange and white ribbon is for concerned parties (friends, family, and what nots)

A red and black ribbon is for past/current survivors.

</div></font></blockquote><font class="post">

(http://teenforums.studentcenter.org/...c.php?t=121223)

I haven't seen any ribbons for sale though. Perhaps they are sold in the U.S?