What a great idea! Much better than athletes or pop music people.
How about posters of the Declaration of Independence?
http://www.allposters.com/-sp/Declaration-of-Independence-Posters_i5129661_.htm
National Archives has a “Kids Decor” page, but it won’t load for me.
https://www.nationalarchivesstore.org/collections/documents
In our prisons we can broadcast the big fella 3 hours a day while they’re in their cells. The rest of the time it should be Barry Manilow.