I've been having great fun figuring out how to do cathedral window blocks so I can make a pillow for a friend who needs more fun cushions on her couch. It's definitely a learning curve, although the process itself isn't hard, it just has about a million steps. I've discovered that it's the points that make or break it, so I'll have to be more careful with those mitres next time I try it - which I think I will. I'm using this tutorial at House of a la Mode.
A question for experienced quilters about templates - I've been using a thin cardboard one to form the blocks, it's just a big 15" square that you use with an iron to mitre corners and fold over the edges evenly. The cardboard hasn't really held its shape all that well with the heat of the iron, and I think it's partially the reason why my corners weren't perfectly mitred. What would you recommend instead? Can you iron template plastic?
