Because I could not remember details of the samples Philippa provided, I dug out my copy of the A-Z of Crewel Embroidery - to which Philippa contributed, as which has a couple of pages of the sorts of stitches she was suggesting. I tried out a number of these on the different leaves of the design.
I chose to vary the colour of the French knot background.
This was so enjoyable. I really like exercises that give me freedom to play and this was an elegant design. I've got a bit of an idea for what I might do with this piece. I've also got an itch to do more crewel work!