The Beatles would often write a verse in major and then a chorus in minor with the same tonic (Fool On The Hill, Michelle, etc...)
They would also use the picardy 3rd trick by playing the major 4 chord and then following it w/a minor 4 chord ( C C-). I believe you can find an example of that in the song In My Life.
There really is a lot to be learned about songwriting from studying the works of the Beatles.