I have mentioned before that Slime Moulds are not the most photogenic of organisms (note I had to use this word since they are neither plants, animals nor fungi). Those I have found have all been in the stage where the single-celled stage has grouped itself into a slime-like mass, and before they produce the fruiting bodies. Anyway, here are a few:
#1 is Fuligo septica, one of the few to have a vernacular name. It is known as 'Dog's Vomit'. I think that the dog must have been round the back of the local curry house. Photographed within a wood.
#2 is, I think, another Fuligo species. Whereas most slime moulds seem to be on dead wood, this was crawling (if that's the right word) up a stem among the brambles.
#3 is Reticulata lycoperdon, found on a very wet bench in the open in a small nature reserve near Chester Zoo.
All of these were just a few centimetres across.
The photos were all taken with my Canon PowerShot, so don't expect DSLR quality.
John