There’s often been poster competitions at State of the Map, have you seen anything interesting?
OSM is all about free geodata, so freely licenced images are better. If you suggest an image, please make sure we can use it. A Creative Common licence is best. You can upload the image to the OSM Wiki, which ensures others can use it too (and select the right CC licence).
If you know any good quotes, you can add them to the OSM Wiki Quotes page.