I guess there are too many legal black holes going down this route. I would be different from pininterest as it is a site that generally would have people with their own photographs (the site is information on a specific country), but yeah.. Lawyers scare me. I am still thinking going down the route of making a gallery, but scrap the idea of posters. I have seen a few sites be successful with gallerys even though they are obviously carrying copyright material and they are pretty large. I would link an example but it has NSFW content that some users may find offensive.