Fungi

What!? This mushroom is really weird... It could be a rare and exotic, psychoactive Psilocybe. I'm not sure though; the second picture doesn't look so Psilocybe to me and I don't know any species which look exactly like the others either. But if I'm right the blue tones are due to the active chemicals reacting with oxygen as the mushroom ages. It'd be interesting to see what the experts over on Mushroom Observer think of this. If you are interesting in perusing it I'd recommend posting it there as they will be most able to help you and I'm sure they'd find it interesting. http://mushroomobserver.org/ If you do add it there, be sure to post a link to the page here so we can follow it's progress :-)