I found a rainbow yarn online recently and bought some to knit up for mini-blankets. It’s a wool blend yarn, from the burn tests I did, and it knits up as a fingering weight yarn. There were 2 colourways, so I bought both. Neither are a ‘ROYGBIV’ rainbow yarn; the colours mostly knit up that way, but not always, as you can see from the photos. The colours are very blended; there’s no way I could cut and split the yarn so it kept to the traditional rainbow line-up. I still can’t decide which one I like better!
I knit the blankets on my knitting machine, then washed and blocked them. There isn’t a lot of roll because I knit them using every other row, which gave enough yarn to adjust the tension so that they can lie flatter. These are perfect for any newborn photo shoots, not just for rainbow babies!