Below you will find a great Fotobabble student example.
Second grade students created a letter to their parents mimicking a letter from "I Wanna Iguana" by Karen Kaufman Orloff. The students then drew a picture on their iPad using an art app, imported the photo into Fotobabble and then recorded themselves reading their letters.
This type of project can be done using a variety of iPad apps besides Fotobabble like, ShowMe, Educreations, FotoFlo or StoryKit. If using a computer, students can create their drawing using Skitch and then import the picture into Educreations to record their voice.