I've just unpinned the mystery project from my make-do blocking board. I was thinking I'd eventually post a pic of the whole thing, but that's going to be difficult. Here's a detail:
It's a handspun wool-silk blend--not quite black knitted in a simple feather and fan design long-ways. The overall effect is like a long ripple with motif repeated along both long ends of the scarf. I'm afraid an overall pic would just give you a dark blob to look at.