Owen Davies Knotwork Garden Course

I've pulled out three skeins of thread for the flowers - now I've just got to choose one of them. I really like the Iris on the right, but then I'll have to actually use some of my thread. I sort of want to use the blue on the left as it's unlabelled and I don't like things that are unlabelled, but it seems to bland on it's own, so I was wondering about adding the Heatherleigh in with it, or alternating stitches or something. Anyway - here is the picture of them.