This video shows how I made the 14 rosettes that I needed to complete the trim for the new studio. The tool I used is home-made from a tablesaw shaper cutter (Craftsman) which is mounted on a steel shaft set into a woodturning handle. There are a vast array of these shaper cutters available in a variety of shapes. This one was given to me by Ron (http://sawdustandglass.com/index.html) for completing bowl bottoms.
The process takes less than a minute per rosette. I mounted the rosette on the surface of the window trim in the video but for the other windows I am mounting them only 1/4 inch proud of the trim.
Advantages of using rosettes are the appearance and the ease of installation. (No miters to cut)