After reading a book that rhymes, I read the book and then come back to a page that have two rhyming words. We talk about the words that rhyme and then sing a song [to the tune of "Skip to My Lou"]Small, tall [or whichever two words you have noted] these words rhyme Small, tall, these words rhyme, Small, tall, these words rhyme, Rhyme along with me. [You can also do this with a nursery rhyme, pointing out two rhyming words.] Early Literacy Aside--Example: Helping your children to recognize and say rhyming words helps them hear the smaller sounds in words, which develops phonological awarness. This is a skill that will later help them sound out words when they learn to read.
Idea from Pamela Martin-Diaz, Allen County (IN) Public Library