The end of 2009 I started swapping half square triangles with 6 other ladies. Because there are nine blocks we thought we'd swap for nine months and end up with enough hst and a great variety to make this quilt. I finished up the last three months of hst so I could free up my commitments for the summer. By my calculations when we are all done swapping all 7 of us would have made approximately 7, 119 half square triangles!!! Amazing huh?! And very cool not to have to try and get those fabric combinations all from one stash.
I may have shown this before but this is my favorite way to make half square triangles. The formula I use is the finished size+1" x 2. (example 1 1/4" finished+ 1" x 2=4 1/2" square) This is the size square I will cut from both fabrics. I wanted more hst from the fabric on the right so basically I have two squares. You can use a pen, pencil or even your Hera tool to mark diagonal lines. Then sew on both sides on the line.
Cut, press and trim. You'll get 8 hst from one square. It is pretty fast and relatively accurate, depending on your sewing!!