I was bored with Lizbeth thread colours which I had out of storage and went looking for Tatililious' HDTs - size 20 Green Messy Jessy and Key Lime Raspberry Parfait. The pattern is one from Teiko Fujito on page 4 of her 'Tatted Fashion' book.
This was interesting as I tatted the last round first as an edging. I wanted to line a coaster on the inner edge. As I finished the square, it was a little flimsy in keeping its shape, so I decided to tat the square in the centre.