This set was a gift for a friend that I made a while ago. I had a bit of Miss Kate leftovers from a quilt I made this summer. Some of the pieces were very small so I used them in the table runner.
The placemats are 15" circles. The tutorial can be found here. The pattern calls for 9 - 5" squares for each placemat. Be careful not to pull the binding as you are sewing it around the placemat as it will pull the mat up on the edges.