Wind in the Willows Library Project

Hi,
I am the librarian at an English School in Cologne, Germany. Our school just opened a new builing, which is called "Willow House". It gets its name - of course - from K.G.'s wonderful "wind in the Willows". To celebrate the opening, we are planning a literary project on and around WitW. I have been writing to various publishers for posters, displays etc., but there doesn't seem to be too much around. Can anybody help me out here? Do you know of any source I could tap to get some nice promotional/display materials? I would be really grateful for that - thanks!
Barbara at St.George's