I recently purchased the Shel Silverstein book 'Everything On It', published posthumously. I love it. LOVE. We stayed up and read the poems and laughed at how clever, silly, and funny they are. You have to laugh often. It's a true treat.
I also love his other books--my favorites are
The Giving Tree, Where the Sidewalk Ends and The Missing Piece. Check them out. You won't be disappointed!