These are available as 24x36 movie-style posters and 8.5x11 one-sheets, but I can alter them to be just about any size you'd like. Printing is in your court, of course! (Message me if you need another size or a TIFF.)
They are free to use and made up entirely of public domain elements. Download links are in this handy LibGuide:
http://guides.lib.olemiss.edu/posters
I'm working with ALA and the Mississippi Library Association to try and get them more widely distributed, but for now please use them and share them as you see fit! Send me a picture if you do anything fun with them."
His email is at the bottom of the libguide if there are questions.
Best Regards,
Rebecca TischlerReference LibrarianWilliamson County Public Library