On my travels i also found a lovely piece of discarded steel which has been nicely welded on and a really nice shard of slate, i also picked up some large posters that were on the ground. There was a person behind me when i picked up the bit of steel and they must of thought that there was something clearly wrong with me! It was worth the embarressment!
I think this part of the steel looks like rotten old teeth.
I'm so pleased with my finds today. I want to box frame these agaisnt a black background. I will have this done by next week, however the slate is very fragile so i might have to frame it inside some sort of glass frame and coat the slate with a fixative.