I made a wee sample of plying the light blue and light green singles together and I like it. I'm a little surprised that the green doesn't overwhelm the blue because of the difference in value. I'm also a little surprised at how the green makes the blue seem more lilac than it is in the singles yarn. It's about 21 wpi which places it in the fingering weight range although I don't think I would like socks made with 50% bamboo and 50% merino. The bamboo doesn't have enough memory for my liking. It would make a very pretty, soft scarf though.