This activity uses short, fun Shel Silverstein poems to help students identify different literary devices in context. It includes explanation of purpose, straight-forward instructions, definitions of all of the literary devices (with examples), and a model. It requires students to find three examples of each of the following: alliteration, repetition, onomatopoeia, rhyme, and imagery.
This is a great activity for a sub day because it's self-explanatory, and the poems are fun and easy to read. There are a variety of possible answers, however, so it's not too easy. It includes a key with possible answers.
The last section asks students to make up their own examples, and this could be used as extra credit or as an optional extension. The activity could be easily modified for students who need more time by cutting down the number of examples they have to give for each literary device.
The poems are on a separate page from the activity page, and when I used it with my sixth grade LA classes, I made a class set of the poems that classes used all day. If you wanted to get them up and moving, you could enlarge the font on the poems, cut them out, and place them around the room so that students have to walk around and read them.