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

Blithe

Blithe as a bird on a cherry bough.
—Anonymous

Blithe as a grig.
—Anonymous

Danced as blithely and briskly as a lost red maple leaf fluttering madly in a keen October breeze.
—Anonymous

As blithe as the bird that rejoices.
—A. H. Beesly

Blithe as a boblink.
—Robert Browning

Blithe as our kettle’s boiling.
—Robert Browning

Blithe as the lark that each day hails the dawn.
—William Collins

Blithe as finches sing.
—William Cowper

Blithe as shepherd at a wake.
—William Cowper

Blithe as a bird new risen from the corn.
—Austin Dobson

Blithe as the first blithe song of birds that waken.
—Austin Dobson

Blithe as a bird in the spring.
—Tom Durfey

Blithe as May.
—R. Fletcher

Blithe, as if on earth
Were no such thing as woe.
—John Keble

Blithe as the orchards and birds with the new coming of spring.
—James Russell Lowell

Blithe as a blithe bird in air.
—Owen Meredith

As blithe and sunny as the summer days.
—James Whitcomb Riley

Blithe as swallows,
Wheeling in the summer sky at close of day.
—Robert Southey

Blither than Spring’s when her flowerful tresses
Shake forth sunlight and shine with rain.
—Algernon Charles Swinburne

Blithe as the lark on sun-gilt wings
High poised, or as the wren that sings
In shady places to proclaim
Her modest gratitude.
—William Wordsworth