"Lavender blue and Rosemary green,
When I am king you shall be queen;
Call up my maids at four o'clock,
Some to the wheel and some to the rock;
Some to make hay and some to shear corn,
And you and I will keep the bed warm."
I found more than one version of this nursery rhyme/children's song on Wikipedia and this is my favourite.
Just one problem as far as I am concerned: lavender's purple!