The trees that are green?

Have you ever wondered why there were green trees and grass...

Long time ago,
There were blue trees and pink grass.
Each pink and blue looked like glass.

The trees that were blue,
they came with a huge crew,
The blue of the trees,
could be like ice; freeze.

The grass that was pink,
looked liked a baby girls sink,
The pink of the grass,
could surpass,
any other color.

But one day there was rain,
and the colors were in vein,
they were washed away,
just like night washes away day.

The blue and pink had disappeared,
then came this color that was weird
The trees and grass were green.
which was foreseen.

The rain washed all the colors,
and only left green.
which left a beautiful scene.

So now we know,
that trees were blue and grass was pink.
But the rain washed everything away.
And only left the green sleigh.