Her promotion came completely out of the blue
He called me out of the blue yesterday with some exciting news
The storm appeared out of the blue, catching everyone by surprise
She decided to quit her job out of the blue and travel the world
An offer to buy our house came out of the blue
The idea for the novel struck me out of the blue
He arrived at the party out of the blue, uninvited but welcome
The solution to the problem appeared out of the blue
She ended our friendship out of the blue, and I never understood why
The recognition for his work came out of the blue after many years
I cannot believe you are here, out of the blue!
I had a surprise visit planned for you.
This is the best surprise I have had all week.
The idea came to me out of the blue
The idea appeared unexpectedly
The idea arrived without warning