Yes, there is a free pattern out there somewhere for this because I have used it. I made a wedding quilt for my sister and BIL. They have been married now almost 19 years so I have to figure about 20 years ago I made the quilt. I don't know where I got it but most likely in a quilting magazine and most likely in an edition of Better Homes and Garden Quilting Magazine. That is the only magazine I subscribed to back in the day. If my memory serves me right they are 60 degree angles. Was very easy to make. I will have to do some real digging for the pattern. This is one of those times that searching the internet for the pattern may be easy. It was called "The Gift Box" if my memory is right.