Along with the photos compiled by Adriana, I have been searching high and low on my favorite stock photo site and Flickr. I have made available to you all of the photo files I have found thus far. (Click on blue box.net "view my files" button in the side bar. They are in folders "Geometry Cabinet Matching Cards and Geo cab photos.) Consider it a base set ... I plan on adding to it whenever I see a nonagon, more decagons, etc. Another suggestion is to cut out photos from magazines when you happen upon that cherished nonagon!
Hope you and your children enjoy!