I finished the knitting portion of the pillow and am blocking it. I seem to have 4 identically sized squares of knitting, although secretly in my heart I know that two of them have one more row than the other two. So I will join the same-sized ones together across, and then join those two wide pieces together up-and-down, and hopefully it will work. I don't think the height difference will be visible.
If all goes well, there will be pictures of the finished pillow tomorrow!