There are a whole slew of fabric Cathedral Window ornaments out there. I started with this tutorial from Constantly Quilting, which tells you what size to cut the squares and directs you to a tutorial on another website. I was disappointed with my results --
Then I looked at this one, over at Crafter Without a Cat, and got even more confused. It's a more complex pattern, but the tutorial that it steered me towards was better than the first one I started out with.
I don't know if I'd get better results if I tried again, now that I understand what I'm supposed to be doing, but for the moment I'm giving up on these.
Take a look at these ornaments that I found on etsy. I can't make one block, and she can put that many into a single ornament and have them look that good?! I'm awed by that level of skill.