Pinwheel blockCut 4 half square triangles each from background and fabric 3 (green) using a half square triangle ruler.
Sew half square triangle units together, then in to a Pinwheel block as shown.
For border 1, cut 4 strips 2½ inches wide.
For border 2, cut 5 strips 4½ inches wide.
The backing and batting will need to be at least 50 inches square.
Cut 6 strips for the binding, instructions available here.
Part 1, Part 2, Part 3