A great website to use as a resource is www.readwritethink.org. I was looking for some information on activities for phonemic awareness in the classroom today and came across the following lesson plan: Generating Rhymes: Developing Phonemic Awareness. The best part is that this lesson plan is free!
The overview says: "Learning to recognize rhyming patterns in language is an essential skill for emergent readers. As students manipulate words and sounds to create simple rhymes, they become aware of word and letter patterns that will help them develop decoding skills. In this lesson, students become familiar with 12 rhyming pairs of one-syllable words as they create rhyming lyrics to known songs ("Down by the Bay"), give rhyming words for a given keyword in a poem, and interact with their peers to find rhyming pairs of word cards. Students then demonstrate their knowledge through an individual assessment exercise."
Rhyming words are a great way to help children with phonemic awareness. Many children who struggle in this area will respond to music or song. Head over to http://www.readwritethink.org/classroom-resources/lesson-plans/generating-rhymes-developing-phonemic-121.html and check out the lesson plan!