I think its easy.
From the guys:
The Beatles (a double album known as the White Album)
Help!
and the underrated Yellow Submarine (its almost the soundtrack from the film but Hello Bulldog and Its All Too Much are great rocks)
From their solo works:
Paul: Band On The Run, Tug Of War, McCartney II (underrated but a good work indeed), Ram (in Pauls style when he was with the guys)
George: All Things Must Pass, Extra Texture (Read All About It) (a very underrated one, but my favourite)
Ringo: Ringo (His mates helping him a lot, but Ive not got it), Goodnight Vienna
John: Mind Games, Plastic Ono Band, Walls and Bridges, Imagine, Sometime in New York (underrated but one of my favourite from him), Double Fantasy (only his songs...Its what Ive heard
)