I recently purchased this:
It's 50% lama and 50% wool by Wool in the Woods. The colors really convinced me to buy it. Here's a closer look:
The woman at the not-really-local yarn shop suggested a moss stitch scarf. She said the little bumps would really make the colors pop. I'm not a huge fan of constantly switching between knits and purls--but if moss really does accent colors then I'll go for it.
I considered going for My So Called Scarf. But, this yarn doesn't do the thick-thin deal and I think that's part of the charm of MSCS. (Plus, not knitting MSCS will give me more reason to get my hands on Manos Del Uruguay.)
I've also been eyeing this: http://www.yarnharlot.ca/blog/archives/2006/10/12/one_row_handspun_scarf.html
It looks really cool, but, I think my yarn changes color more often.
If any of you have played with these patterns using varigated yarn and really liked them, please let me know. Or if you have other patterns for varigated yarn that I should check out I'd love to hear from you as well.