Shel Silverstein makes effective use of consonance in a number of his poems. A lot of us probably haven't read those poems since we were a kid but they are just as good as they have always been. I recently started reading them to my daughter and have been pretty delighted by how much is going on inside of the poems.
There is one poem called something like "Ickle Me Pickle Me Tickle Me Too" that has all kinds of great examples of consonance. My daughter loves listening to them and I am loving reading them out loud.