OMG! That is a beautiful pillow. I just bought that CG pineapple ruler and haven't even taken the plastic off yet but you sure have inspired me to do so. Making that block looks so easy with this ruler. I happen to see it on MSQC with Jenny Doan's tutorial. Sorry, don't have any answer for helping you with the corners but I am sure some wonderful person on this QB will have a great idea for you.