Here are some other designs I give, all sized to fit on 5" blocks used in Super Sixteen.
Page 37 of "Answers & Extras" contains a diagram for marking borders with gentle curves that fit the 5" blocks. Trace it on template plastic and trim the curved edges off. Draw the borders, reversing and repositioning the template as needed. (Since pages are only 8-1/2" x 11", the template won't fit half the quilt. It's easy to draw a couple of inches freehand to fill gaps.)