Skippyjon Jones, Clifford the Big Red Dog, The Lorax
Where's Waldo?, The Very Hungry Caterpillar
The Cat in the Hat, the protagonist from The Snowy Day by Ezra Jack Keats
I saw this bulletin board after I'd already made the one above, but I'm still so glad I found it. The silhouettes are amazing, I especially love the Clifford silhouette.