One of my favourite spots at the Festival of Quilts was the Virtual Studio run by the Committed to Cloth ladies. They had some plastic shape sets for shibori so I had to get some. OK , I probably bought all the sets.
I did three, one metre pieces which is really as big as I can do easily I think.
I had three primaries mixed up already and pre-soaked the fabric in soda ash and used them damp (too impatient to wait for them to dry)
Fuschia and Lemon Yellow (and a bit of leaking Turquoise I think) and rectangular window shapes.
My favourite I think
Fuschia and Turquoise with circles