Hop on Pop by Dr. Seuss is a great book to help students develop phonemic awareness. This book is filled with lots of rhyming words, simple sentences, and repetition. The rhyming words in this book tend to be from the same word families (words that have the same ending.)
Fox in Socks by Dr. Seuss is another great book that helps students develop phonemic awareness. This book is the next step in increasing understanding of rhyming words and that different combinations of letters can produce the same sounds (-ox and -ocks).