Yeah, I actually did. I ran around Sisters of Erollisi island and shot anything that looked like a Wood Elf, killing 100 at a time (1 stack of summoned arrows). Faction hits for Crushbone orcs was 1 point per kill and oddly enough, all other factions went down by 1 point, except Faydarks Champions, which was 2 points. That means if I killed 3000 of them, maybe then Clerics and Soldiers of Tunare might dislike me. But that was easily fixed with bonechips and such.
So I got to dubious, ran around Crushbone and hailed any blue-skinned dude. Nothing responds or talks back. So even though you COULD raise faction with the orcs, there seems to be no point. Besides that, dark elves start out dubious to them anyway, due to their uneasy alliance (Indigo Brotherhood).
Feeding about 200 stacks of muffins to Pandos Flintside completely reversed the factions in just a few minutes.