Here is a list of books for opposites. I haven't yet seen all of them but I will be going to the library to assess how wonderful or ridicules they are.
The Opposite - Tom MacRae
Clifford's Opposites Board Book - Norman Bridwell
What's the Opposite, Piggywiggy? - Christyan Fox
Kipper's Book of Opposites - Mick Inkpen
Maisy Big, Maisy Small - Lucy Cousins
Black? White! Day? Night! - Laura Vaccaro Seeger
Black Cat, White Cat - Chuck Murphy
Skippyjon Jones: Up & Down - Judy Schachner
Night Monkey, Day Monkey - Julia Donaldson
Curious George's Opposites -
Eric Carle's Opposites - Eric Carle
Two Little Trains - Leo & Diane Dillon
Slide 'n Seek Opposites - Sandra Boynton
Olivia's Opposites - Ian Falconer
What's Up, Duck? - Tad Hills
Oh My Oh My Oh Dinosaurs - Sandra Boynton
Big Dog, Little Dog - P.D. Eastman
Opposites - Sandra Boynton
The Foot Book - Dr. Seuss
Popposites: A Pop-up Opposites Book
Dinosaur Roar - Paul & Henrietta Stickland
No No, Yes, Yes - Leslie Patricelli
Big, Little - Leslie Patricelli
Yummy Yucky - Leslie Patricelli
Inside Outside Upside Down - Bright