I used the bulky organic cotton from Pickles in the Vanilla and Pale Sky colorways - but I only had 1 skein of each. After using them both, I still only have half a pillowcase. What to do? I'm considering making the back of fabric instead of knitting it, but we'll see!
Update: I sewed on an Echino fabric for the back. Note to self: Remember to use a stretchy fabric when sewing something together with knit.. Oh well, it turned out OK nevertheless: