cut out 4 squares of your background fabric,,,,
cut out 4 squares of you pinwheel fabric,,,
i made mine 6 inches
take 1 square of your background fabric and 1 square of your pinwheel fabric...fold your pinwheel fabric in a triangle,,line up on background fabric,,,sew close to edge,half way down fold the bottom of triangle over to corner,,,then finish sewing down,,,do 4 squares like this then lay out to get the pattern and then sew together,,real easy to do,,just time consuming,,takes a lot of material