Oink by Arthur Geisert
In this delightful book of etchings, Mr. Geisert follows a family of young piglets (and their mother) through a day of happy nursing, mud puddle wallowing, napping, mischief-making and chastisement. The illustrations are mainly in black and white with pink for the pigs.
Only one word appears in the book, "Oink." It doesn't take young children long to realize this is the only word and to figure out how to read it themselves with the proper volume and meaning. It's astounding how much that one word can say. Mr. Geisert's illustrations and drawings of the letters themselves allow children to know exactly what's going on and to joyfully "read" the story aloud to anyone who will listen.
I adore this book and love reading it with my children.