gratification vs rainbows and unicorns

gratification

noun
  • A gratuity; a reward. 

  • The act of gratifying or pleasing, either the mind, or the appetite or taste. 

  • A feeling of pleasure; satisfaction. 

rainbows and unicorns

noun
  • A wonderful (but often unrealistic) scenario. 

How often have the words gratification and rainbows and unicorns occurred in a corpus of books? (source: Google Ngram Viewer )