From the dimmest recesses of my brain, bt not necissarily in this order:

Yellow is the colour of my true love's hair,
In the morning, when we rise,
In the morning, when we rise.
That's the time, that's the time
That I love best.

Blue is the colour of my true love's eyes
etc.

Green is the colour of the sparkling corn,
etc.

Mindless and vapid unless you're awfully young and romantic -- Tom