delight vs rainbows and unicorns

delight

noun
  • Joy; pleasure. 

  • Something that gives great joy or pleasure. 

verb
  • To give delight to; to affect with great pleasure; to please highly. 

  • To have or take great pleasure. 

rainbows and unicorns

noun
  • A wonderful (but often unrealistic) scenario. 

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