Out of time
Too late for the sneak peak and without inspiration for a title, I post without fanfare these 5 butterflies for donation:
And below is my block for the Rainbow Sampler. I was delighted to see the secondary pattern formed when these are set solid. Notice that they have to be tail to tail (or head to head) in order for the sky parts to form into even triangles as the head sky is larger than the tail sky.