Man, I forgot the most important stuff on the Cathedral Window Pillow. I used the tute from Heather at A La Mode Fabric. There is a Part 1 that talks about sizes and ironing oragami and a Part 2 that is the sewing part.
You should try it, really. Just one. And then you can cross it off your "Things I Have Done" list. Unless your mother-in-law wants one too.
Oh, and the fabric is Whimsy by Michael Miller. I think.