Wordless books are books that contain illustrations but no text, allowing students to use their imagination to create their own stories. These books give students an opportunity to hone their writing skills, which helps them build foundations of language, basic story structure, and an understanding of the relationship between pictures and words. (from Reading A-Z)
Wonderful World of Wordless Books ... EverythingESL.net

Here are some good wordless books:
Deep in the Forest...by Brinton Turkle
What if Goldilocks lived in a cabin in the woods and roles were reversed? In warm scenes infused with a single color (gold), the soft black-line work creates a homey atmosphere irresistible to a fuzzy cub. Readers in the know will relish his antics and relax when he escapes.
Pancakes for Breakfast...by Tomie dePaola

for lists of more books...see:
wordless and nearly wordless books
Reading A-Z
books by topic