We had a neighbourhood gathering last evening, so I asked my neighbours about yesterday's big, green caterpillar. They said it's called a 'druiwewurm'. That translates as grape worm. I googled it this morning and found absolutely nothing resembling my caterpillar. But it's a start. Thanks to those who have had a go at identifying it!
Yesterday afternoon I shuffled stars and decided on an arrangement of colours:
this tutorial to help me. I'm not quite confident about it yet, I may have to make some changes, which is why I haven't threaded the ends in:
round 6 of the Renulek doily: