Where can I set the color of the multicolumn menu border?

I try to promote TLB there, but maybe not very successful. :oops:

I try to spread the word as well. Posted some huge shots to some of the customization communities I visit regularly:
deviantArt: http://ethsza.deviantart.com/art/True-La...-156686675
customize.org: http://customize.org/screenshots/70095
aqua-soft.org: http://www.aqua-soft.org/forum/topic/534...ntry535102
Lifehacker "desktop show and tell" pool on flickr: http://www.flickr.com/groups/lifehacker-...tell/pool/