Our office is closing and we have a number of unused advertisements that were to be used on the sides of Metro buses. I don't know the exact dimensions, but they are obviously large in nature. Some are very colorful (blue-based), and at least one is photographic and mostly dark-colored
They are available for pick up during business hours (9-6, M-F); if you want a great quantity of them, there is a wheeled office chair that has served us very well as a substitute for a dolly. If you use more than one sentence in your reply, and/or if you tell me what creative thing you'd like to do with them, you'll move up the ladder of prospective adoptive owners. I can even see about taking pictures of them for you ahead of time, if we can find our office camera.