I just couldn't wait to post a picture of this (unfortunately it's dark and so are my pictures). I've been looking at pictures of cathedral window quilting here and here... and subsequently reading over the tutorial here... which made me actually try it.
This is really not nearly as hard as I thought it was going to be! It is time consuming because of all the folding and ironing. I machine stiched everything (just pinning the four edges down first) so the sewing went very quickly.
I do think I should have paid a bit more attention to cutting my fabric more perfectly... or folding it more perfectly. Although with just doing it rather haphazardly it still turned out really well! I'll definately do more of these. Someday when I'm in the mood to iron.