Add rxvt-unicode-256color to /etc/DIR_COLORS .
Is this name generic enough so I could commit it upstream?
Yes. http://cvs.schmorp.de/rxvt-unicode/src/rxvt.h?r1=1.398&r2=1.399
http://git.savannah.gnu.org/cgit/coreutils.git/commit/?id=v8.5-151-g42681e9
coreutils-8.5-alt3 -> sisyphus: * Tue Sep 14 2010 Dmitry V. Levin <ldv@altlinux> 8.5-alt3 - Backported upstream fixes to tac(1). - Backported upstream updates to /etc/DIR_COLORS (closes: #24052).