Rocky Mountain House To make a Ninepatch Pinwheel block I start with a design on a ninepatch grid. And then determine the piecing. I pick some colors. Then I use four of the block to make a kind of pinwheel. Then I play with fabric colors and the block setting to see what sorts of quilt designs I can discover. I've named this Ninepatch Pinwheel block after Rocky Mountain House in my home province of Alberta. I am delighted with how the quilts it produces are so different from each other.