I even surprised myself by how quickly I finished this! And that includes at least 6-8 times where I got it wrong (it was getting ridiculous), had to cut and re-start. For some strange reason, I kept forgetting to do the bottom large rings in pairs! I don't know, I think I had a mental block about it. So in spite of that, this edging did work up pretty fast.
As well as adding blue to the spray, I decided to do a yellow pin stitch around the edge of the handkerchief before attaching the lace. I thought it would pull it all together more.