Google provides free posters and handouts that you can print at home and use as bookmarks in magazines, as tent cards on the table or hang them as wall posters.
These Google posters are essentially PDF files and contain search tips & tricks to use Google more effectively.
Other than Google Search, there are free posters for Google Earth, Google Books and Google Scholar. If you are looking for a large version, try the Educators Poster that can be scaled by any amount without distortion. It has real examples to create better Google searches.
Google Librarian Central [via Google Newsletter]