So there is a rather exciting variation showing up on Quiltville. In the corner unit (not the corner of the quilt, but the corner of the block), people are using HSTs rather than squares. Since the examples I saw were alternate colorways, I wasn't quite sure which HSTs they were using. It occurred to me that this might be a way to introduce more green -- make neutral/green HSTs for that spot. I haven't really gotten my mind around all the ways this affects the appearance of block, so I'm going to experiment.