The one on the far left is navajo-plied slightly thick and thin yarn, the middle is two singles plied together, and the right one is a very thick-and-thin singles plied with some thread from Superior Threads (using Highlights, one of my all-time favorite machine quilting threads).
And some gratuitous close-up pictures:
Kinda fun!! I still have to measure them for WPI and I haven't measured the yardage yet. I want to try knitting with them, although I'm not sure what--probably just some stockinette pieces with garter-stitch borders, just to play. I figure that I can always rip them out and re-knit if a better project comes along!
You can go to Rachel's blog for some pictures of what other people have done with her roving.
Thanks, Rachel, for the roving!
And yes, LisaK, I'm working on more pictures of the trip. :-)