Opposites are a fun concept to share with your baby. We have several that we enjoy, although none of which I can find images for! Here are some that I've read in stores or just look good to me!
Baby Happy Baby Sad (Leslie Patricelli board books)
My Little Opposites Book
Black & White : Board Book
Winnie the Pooh's Opposites (Winnie-the-Pooh)
What opposite books do you recommend?