Year 3 Tie-Dye

Year 3 are making tie-dye shirts. We tied lots of knots in our shirts and first dyed them in one colour.
The next week we dyed them a second colour. We can't wait to take the knots out to see the finished product.Now which colour shall I use?

The Finished Product
(click on any image for a larger version)
The finished tie-dye shirts The finished tie-dye shirts The finished tie-dye shirts The finished tie dyes The finished tie dyes