This 100% Peruvian wool is available in natural colors(produced entirely without chemical soaps or dyes) and dyed heathers. Washed with vegetable oil soap and exhibiting a variety of beautiful natural colors, the undyed version of this yarn is perfect for those with chemical sensitivity, and is also good for the earth! A great choice if you wish to knit something like the sweater below which grades from one natural shade to another.
Each skein contains 478 yards and knits at 3.5st/in on US 10 needles (or 4 on a 9). The afghan below is a simple garter stitch mitered square pattern (I believe my sister cast on around 93 sts for each square). The afghan can be done with 4 skeins (each of a different color). The cabled sweater shown below took 4 sks and the pattern is a free download.
For a very similar wool but in a slightly lighter gauge (4-4.5/inch), check out Homestead.
Price: $23.75/skein (my new shipment had a price increase 11/25)