one of my favourite collection of images is of decaying billboards in various states of disrepair. some of them are rusted, some of them look like wireframes, some are half torn, some look like they are advertising an old house or clouds or some trees. here is the link to that album:
i like this one from the bunch a lot:
it is a billboard on top of a green and white painted building with a fence in the foreground of the building. the billboard is all torn up with only some of the border bits remaining. the metal frame of the billboard looks to be advertising a bunch of white clouds on a blue sky in the backround.