Thanks to all of you! Looks like this has a lot of names - curved, extended, improved and glorified nine patch. Probably lots of others too. I really feel stupid now though because I've been searching through lots of books for the past week and it turns out that I have this pattern in a book under the name "glorified nine patch". Just didn't recognize it since it was made with scrappy "arms", a white center cross with embroidered signatures and yellow outside circles.