Ok, Judy has exposed me for the farce I am! LOL Yes, I knew what her mystery was... but I did make three more so I could sew along with you all. I will post those three as soon as I finish them. But for now, here is Judy's mystery and one of my little toppers I made using another block pattern. These little toppers are addictive. To figure the size of the corner squares you just use the same size as the corner triangles for a quilt that is set on point. Here is a wonderful chart from Bonnie K Hunter.
www.quiltville.com/onpointmath.shtml [ATTACH=CONFIG]559336[/ATTACH][ATTACH=CONFIG]559337[/ATTACH] The first pix is a 12" block with a border added and the second one is Judy's Personal Mystery block. They end up being about 24" square.