Go to a search engine and google "A Pocketful of Rhymes." The poems at this site use descriptive words galore and have the reader guess what is being described in the poem. It is just great!
As I was cleaning and organizing at home (I'm on spring break), I ran across Partner Poems for Builing Fluency
by Scholastic, which I just love.
You might also want to go to the third grade board and post your question. That group really knows how to help!