Oooh, Dotty, what a pretty dyeing job! And I love the colours in the photograph too. You're inspiring me to set up some kind of light box. Would purple work to get you any kind of good colour? I think that might come out as pinkish and yellow.
And don't look now, but Little Knits has Araucania Atacama (100% alpaca) on sale for $40/bag (10 skeins, 110 yards/skein). This is the colourway that grabbed at me, but there are lots of others, including a gorgeous purple one.