Tothegholdrush

Irving Berlin I believe wrote the following.... I think this might explain the phrase !!!

I was blue, just as blue as I could be
Evry day was a cloudy day for me
Then good luck came a-knocking at my door
Skies were gray but theyre not gray anymore

Blue skies
Smiling at me
Nothing but blue skies
Do I see

Bluebirds
Singing a song
Nothing but bluebirds
All day long

Never saw the sun shining so bright
Never saw things going so right
Noticing the days hurrying by
When youre in love, my how they fly

Blue days
All of them gone
Nothing but blue skies
From now on

[2]
I should care if the wind blows east or west
I should fret if the worst looks like the best
I should mind if they say it cant be true
I should smile, thats exactly what I do