Forsooth wrote:
Best way to do this would be to make a human character, and let his adjective/description subtly reveal the taint in his blood.
I realize that's not quite what you wanted, but trying to play a half-orc instead of your actual race (which everyone sees every time they look at you) is considered by many as bad roleplay. Not that it isn't a neat idea, but it doesn't fit in SK's mechanics or gameworld.
Help file: Half-Elves are the offspring of a human and an elf or a deep-elf.
Forsooth's advice is pretty good. Playing a human who is 1/8, 1/4 orc or something like that would work.