Frank J. Wilstach, comp. A Dictionary of Similes. 1916.

Big

Big as a church debt.
—George Ade

Big as an elephant.
—Anonymous

Big as a house.
—Anonymous

Big as a whale.
—Anonymous

Big as life and twice as natural.
—Anonymous

Big as all out of doors.
—J. R. Bartlett’s Dictionary of Americanisms

No bigger than an unobserved star.
—John Keats

As big a liar as Tom Pepper who got licked out of hell for telling lies.
—Vincent Stuckey Lean (Collectanea)

As big as a parson’s barn,—always ready for more.
—Vincent Stuckey Lean (Collectanea)

Looking as big as bull-beef.
—English Proverb

Another stain, as big as hell can hold,
Were there no more but it.
—William Shakespeare