So, having spun and plyed about 150g of Lleyn fleece, I rainbow dyed the lot and turned it into a fabric on my new rigid heddle loom ( a 20" / 50cm Ashford Knitter's Loom). Not enough fabric to do too much with, so the cats are going to get another new blanket.
I had three skeins which were rainbow dyed using Ashford Dyes in navy blue, pink and yellow, chosen because I wanted to experiment obtaining secondary colours where the two primaries overlapped. I dyed the skeins in different batches. The first skein had the most saturated colours (on the left of the picture), the dyes being diluted for the second and third skeins. I also 'painted' smaller bands of colour on the last skein, resulting in a more yellowy look overall.
I used a green 4-ply wool for the warp and a 5 dpi heddle, which resulted in a more weft-faced fabric. I had problems with pooling of colour with all three skeins which meant having to cut the weft every so often to break up the colour repeating in the same place all the time.
It was an interesting experiment and a first for me as it's the first time I've ever used any homespun to create something, even if it's only ever going to be a cat blanket!!